Remove various unused game functions

If can_configure is false, then the game's configure() and
custom_params() functions will never be called.  If can_solve is false,
solve() will never be called.  If can_format_as_text_ever is false,
can_format_as_text_now() and text_format() will never be called.  If
can_print is false, print_size() and print() will never be called.  If
is_timed is false, timing_state() will never be called.

In each case, almost all puzzles provided a function nonetheless.  I
think this is because in Puzzles' early history there was no "game"
structure, so the functions had to be present for linking to work.  But
now that everything indirects through the "game" structure, unused
functions can be left unimplemented and the corresponding pointers set
to NULL.

So now where the flags mentioned above are false, the corresponding
functions are omitted and the function pointers in the "game" structures
are NULL.

41 files changed, 71 insertions, 539 deletions

diff --git a/blackbox.c b/blackbox.c
index 22ef4cb..51a15f6 100644
--- a/blackbox.c
+++ b/blackbox.c
@@ -468,16 +468,6 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     return dupstr("S");
 }
 
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 struct game_ui {
     int flash_laserno;
     int errors;
@@ -1540,19 +1530,6 @@ static int game_status(const game_state *state)
     return 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame blackbox
 #endif
@@ -1573,7 +1550,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     true, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -1592,9 +1569,9 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/bridges.c b/bridges.c
index 510af44..db4a66e 100644
--- a/bridges.c
+++ b/bridges.c
@@ -3188,11 +3188,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -3297,7 +3292,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/cube.c b/cube.c
index 21df46d..1969bfb 100644
--- a/cube.c
+++ b/cube.c
@@ -1023,22 +1023,6 @@ static void free_game(game_state *state)
     sfree(state);
 }
 
-static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, const char **error)
-{
-    return NULL;
-}
-
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 static game_ui *new_ui(const game_state *state)
 {
     return NULL;
@@ -1758,19 +1742,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame cube
 #endif
@@ -1790,8 +1761,8 @@ const struct game thegame = {
     new_game,
     dup_game,
     free_game,
-    false, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, /* solve */
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -1810,8 +1781,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/dominosa.c b/dominosa.c
index 25f2a0b..e60cb46 100644
--- a/dominosa.c
+++ b/dominosa.c
@@ -3369,11 +3369,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -3463,7 +3458,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/fifteen.c b/fifteen.c
index 2ba25af..0d19288 100644
--- a/fifteen.c
+++ b/fifteen.c
@@ -1080,19 +1080,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame fifteen
 #endif
@@ -1132,9 +1119,9 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/filling.c b/filling.c
index 7dec656..215eefe 100644
--- a/filling.c
+++ b/filling.c
@@ -2093,11 +2093,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2198,7 +2193,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,				   /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_NUMPAD,		       /* flags */
 };
 
diff --git a/flip.c b/flip.c
index 9486f19..cc80b09 100644
--- a/flip.c
+++ b/flip.c
@@ -1321,19 +1321,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame flip
 #endif
@@ -1373,8 +1360,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/flood.c b/flood.c
index c015c7e..8f4df00 100644
--- a/flood.c
+++ b/flood.c
@@ -1341,19 +1341,6 @@ static float game_flash_length(const game_state *oldstate,
     return 0.0F;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame flood
 #endif
@@ -1393,8 +1380,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/galaxies.c b/galaxies.c
index c367b29..d69ed84 100644
--- a/galaxies.c
+++ b/galaxies.c
@@ -3633,11 +3633,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 #ifndef EDITOR
 static void game_print_size(const game_params *params, float *x, float *y)
 {
@@ -3868,7 +3863,7 @@ const struct game thegame = {
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
 #endif
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/guess.c b/guess.c
index dd6462b..5046f98 100644
--- a/guess.c
+++ b/guess.c
@@ -359,16 +359,6 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     return dupstr("S");
 }
 
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 static bool is_markable(const game_params *params, pegrow pegs)
 {
     int i, nset = 0, nrequired;
@@ -1500,19 +1490,6 @@ static int game_status(const game_state *state)
     return state->solved;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame guess
 #endif
@@ -1533,7 +1510,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     true, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -1552,9 +1529,9 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/inertia.c b/inertia.c
index 213ad35..2f352d3 100644
--- a/inertia.c
+++ b/inertia.c
@@ -2205,19 +2205,6 @@ static int game_status(const game_state *state)
     return state->gems == 0 ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame inertia
 #endif
@@ -2257,8 +2244,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/keen.c b/keen.c
index ec6e512..be06013 100644
--- a/keen.c
+++ b/keen.c
@@ -1490,16 +1490,6 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     return out;
 }
 
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 struct game_ui {
     /*
      * These are the coordinates of the currently highlighted
@@ -2231,13 +2221,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    if (state->completed)
-	return false;
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2492,7 +2475,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     true, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -2513,7 +2496,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON | REQUIRE_NUMPAD,  /* flags */
 };
 
diff --git a/lightup.c b/lightup.c
index c37be86..854d28a 100644
--- a/lightup.c
+++ b/lightup.c
@@ -2255,11 +2255,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2363,7 +2358,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/loopy.c b/loopy.c
index 7fe91ff..960fafa 100644
--- a/loopy.c
+++ b/loopy.c
@@ -980,11 +980,6 @@ static void game_free_drawstate(drawing *dr, game_drawstate *ds)
     sfree(ds);
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static float game_anim_length(const game_state *oldstate,
                               const game_state *newstate, int dir, game_ui *ui)
 {
@@ -3694,7 +3689,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false /* wants_statusbar */,
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,                                       /* mouse_priorities */
 };
 
diff --git a/magnets.c b/magnets.c
index 0379fa0..0cd9adb 100644
--- a/magnets.c
+++ b/magnets.c
@@ -2344,11 +2344,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2485,7 +2480,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/map.c b/map.c
index 553a683..0d90f31 100644
--- a/map.c
+++ b/map.c
@@ -2261,16 +2261,6 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     return dupstr(aux);
 }
 
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 struct game_ui {
     /*
      * drag_colour:
@@ -3097,11 +3087,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -3275,7 +3260,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     true, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -3296,7 +3281,7 @@ const struct game thegame = {
     game_status,
     true, true, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/mines.c b/mines.c
index 5674849..711fc50 100644
--- a/mines.c
+++ b/mines.c
@@ -3215,14 +3215,6 @@ static bool game_timing_state(const game_state *state, game_ui *ui)
     return true;
 }
 
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame mines
 #endif
@@ -3262,7 +3254,7 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
     true, game_timing_state,
     BUTTON_BEATS(LEFT_BUTTON, RIGHT_BUTTON) | REQUIRE_RBUTTON,
diff --git a/mosaic.c b/mosaic.c
index ae8563d..30e65b0 100644
--- a/mosaic.c
+++ b/mosaic.c
@@ -1587,19 +1587,6 @@ static int game_status(const game_state *state)
     return 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return state->not_completed_clues > 0;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame mosaic
 #endif
@@ -1640,9 +1627,9 @@ const struct game thegame = {
     game_get_cursor_location,
     game_status,
 #ifndef NO_PRINTING
-    false, false, game_print_size, game_print,     
+    false, false, NULL, NULL,          /* print_size, print */
 #endif
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/net.c b/net.c
index 73ccb08..cff0c9c 100644
--- a/net.c
+++ b/net.c
@@ -1848,16 +1848,6 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     return ret;
 }
 
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 /* ----------------------------------------------------------------------
  * Utility routine.
  */
@@ -3102,11 +3092,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -3262,7 +3247,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     true, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -3283,6 +3268,6 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/netslide.c b/netslide.c
index c2eab66..1a01be2 100644
--- a/netslide.c
+++ b/netslide.c
@@ -893,16 +893,6 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     return dupstr(aux);
 }
 
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 /* ----------------------------------------------------------------------
  * Utility routine.
  */
@@ -1852,19 +1842,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return false;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame netslide
 #endif
@@ -1885,7 +1862,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     true, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -1904,9 +1881,9 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/nullgame.c b/nullgame.c
index 5942038..c539d1b 100644
--- a/nullgame.c
+++ b/nullgame.c
@@ -68,16 +68,6 @@ static char *encode_params(const game_params *params, bool full)
     return dupstr("FIXME");
 }
 
-static config_item *game_configure(const game_params *params)
-{
-    return NULL;
-}
-
-static game_params *custom_params(const config_item *cfg)
-{
-    return NULL;
-}
-
 static const char *validate_params(const game_params *params, bool full)
 {
     return NULL;
@@ -118,22 +108,6 @@ static void free_game(game_state *state)
     sfree(state);
 }
 
-static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, const char **error)
-{
-    return NULL;
-}
-
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 static game_ui *new_ui(const game_state *state)
 {
     return NULL;
@@ -247,19 +221,6 @@ static int game_status(const game_state *state)
     return 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame nullgame
 #endif
@@ -272,15 +233,15 @@ const struct game thegame = {
     encode_params,
     free_params,
     dup_params,
-    false, game_configure, custom_params,
+    false, NULL, NULL, /* configure, custom_params */
     validate_params,
     new_game_desc,
     validate_desc,
     new_game,
     dup_game,
     free_game,
-    false, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, /* solve */
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -299,8 +260,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/palisade.c b/palisade.c
index d03ee0f..f405efd 100644
--- a/palisade.c
+++ b/palisade.c
@@ -1303,12 +1303,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    assert (!"this shouldn't get called");
-    return false;                      /* placate optimiser */
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -1416,6 +1410,6 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     true,                                     /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,                                         /* flags */
 };
diff --git a/pattern.c b/pattern.c
index 9904b80..68862df 100644
--- a/pattern.c
+++ b/pattern.c
@@ -1994,11 +1994,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2105,7 +2100,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/pearl.c b/pearl.c
index 9603bec..72f36f7 100644
--- a/pearl.c
+++ b/pearl.c
@@ -2599,11 +2599,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2711,7 +2706,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/pegs.c b/pegs.c
index 2fa9a2a..2005a9e 100644
--- a/pegs.c
+++ b/pegs.c
@@ -722,12 +722,6 @@ static void free_game(game_state *state)
     sfree(state);
 }
 
-static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, const char **error)
-{
-    return NULL;
-}
-
 static bool game_can_format_as_text_now(const game_params *params)
 {
     return true;
@@ -1327,19 +1321,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame pegs
 #endif
@@ -1359,7 +1340,7 @@ const struct game thegame = {
     new_game,
     dup_game,
     free_game,
-    false, solve_game,
+    false, NULL, /* solve */
     true, game_can_format_as_text_now, game_text_format,
     new_ui,
     free_ui,
@@ -1379,9 +1360,9 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/range.c b/range.c
index a845b82..bc70c05 100644
--- a/range.c
+++ b/range.c
@@ -1768,12 +1768,6 @@ static void draw_cell(drawing *draw, game_drawstate *ds, int r, int c,
     draw_update(draw, x, y, ts + 1, ts + 1);
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    puts("warning: game_timing_state was called (this shouldn't happen)");
-    return false; /* the (non-existing) timer should not be running */
-}
-
 /* ----------------------------------------------------------------------
  * User interface: print
  */
@@ -1852,6 +1846,6 @@ struct game const thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false, /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0, /* flags */
 };
diff --git a/rect.c b/rect.c
index 5115018..535b007 100644
--- a/rect.c
+++ b/rect.c
@@ -2912,11 +2912,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -3023,7 +3018,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/samegame.c b/samegame.c
index c161234..121ed7d 100644
--- a/samegame.c
+++ b/samegame.c
@@ -1016,12 +1016,6 @@ static void free_game(game_state *state)
     sfree(state);
 }
 
-static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, const char **error)
-{
-    return NULL;
-}
-
 static bool game_can_format_as_text_now(const game_params *params)
 {
     return true;
@@ -1656,19 +1650,6 @@ static int game_status(const game_state *state)
     return state->complete ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame samegame
 #endif
@@ -1688,7 +1669,7 @@ const struct game thegame = {
     new_game,
     dup_game,
     free_game,
-    false, solve_game,
+    false, NULL, /* solve */
     true, game_can_format_as_text_now, game_text_format,
     new_ui,
     free_ui,
@@ -1708,8 +1689,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
diff --git a/signpost.c b/signpost.c
index daf5509..17557a3 100644
--- a/signpost.c
+++ b/signpost.c
@@ -2227,11 +2227,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2314,7 +2309,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/singles.c b/singles.c
index 42ecdbe..51fb23a 100644
--- a/singles.c
+++ b/singles.c
@@ -1788,11 +1788,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -1880,7 +1875,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/sixteen.c b/sixteen.c
index 7c9e7aa..400fa51 100644
--- a/sixteen.c
+++ b/sixteen.c
@@ -1175,19 +1175,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame sixteen
 #endif
@@ -1227,9 +1214,9 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/slant.c b/slant.c
index f7070d7..fef73e0 100644
--- a/slant.c
+++ b/slant.c
@@ -2090,11 +2090,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2207,7 +2202,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/solo.c b/solo.c
index bac19a0..ff98073 100644
--- a/solo.c
+++ b/solo.c
@@ -5336,13 +5336,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    if (state->completed)
-	return false;
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -5661,7 +5654,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON | REQUIRE_NUMPAD,  /* flags */
 };
 
diff --git a/tents.c b/tents.c
index cd7da79..9e8349c 100644
--- a/tents.c
+++ b/tents.c
@@ -2583,11 +2583,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2659,7 +2654,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON,		       /* flags */
 };
 
diff --git a/towers.c b/towers.c
index 661514c..b1f6a16 100644
--- a/towers.c
+++ b/towers.c
@@ -1960,13 +1960,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    if (state->completed)
-	return false;
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2085,7 +2078,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON | REQUIRE_NUMPAD,  /* flags */
 };
 
diff --git a/tracks.c b/tracks.c
index 07a9a80..5375410 100644
--- a/tracks.c
+++ b/tracks.c
@@ -2979,11 +2979,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -3073,7 +3068,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/twiddle.c b/twiddle.c
index 9ec593b..6d86264 100644
--- a/twiddle.c
+++ b/twiddle.c
@@ -1287,19 +1287,6 @@ static void game_redraw(drawing *dr, game_drawstate *ds,
     }
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame twiddle
 #endif
@@ -1339,9 +1326,9 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     true,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,				       /* flags */
 };
 
diff --git a/undead.c b/undead.c
index b31991d..40339ae 100644
--- a/undead.c
+++ b/undead.c
@@ -2770,19 +2770,6 @@ static int game_status(const game_state *state)
     return state->solved;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame undead
 #endif
@@ -2822,8 +2809,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     false,                 /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,                     /* flags */
 };
diff --git a/unequal.c b/unequal.c
index c1d3a30..ed03c0b 100644
--- a/unequal.c
+++ b/unequal.c
@@ -2086,11 +2086,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2180,7 +2175,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     REQUIRE_RBUTTON | REQUIRE_NUMPAD,  /* flags */
 };
 
diff --git a/unruly.c b/unruly.c
index 0a9403e..63d25e2 100644
--- a/unruly.c
+++ b/unruly.c
@@ -1970,11 +1970,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
 static void game_print_size(const game_params *params, float *x, float *y)
 {
     int pw, ph;
@@ -2058,7 +2053,7 @@ const struct game thegame = {
     game_status,
     true, false, game_print_size, game_print,
     false,                      /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     0,                          /* flags */
 };
 
diff --git a/untangle.c b/untangle.c
index e849b5b..1dc4fb3 100644
--- a/untangle.c
+++ b/untangle.c
@@ -1028,16 +1028,6 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     return ret;
 }
 
-static bool game_can_format_as_text_now(const game_params *params)
-{
-    return true;
-}
-
-static char *game_text_format(const game_state *state)
-{
-    return NULL;
-}
-
 struct game_ui {
     int dragpoint;		       /* point being dragged; -1 if none */
     point newpoint;		       /* where it's been dragged to so far */
@@ -1446,19 +1436,6 @@ static int game_status(const game_state *state)
     return state->completed ? +1 : 0;
 }
 
-static bool game_timing_state(const game_state *state, game_ui *ui)
-{
-    return true;
-}
-
-static void game_print_size(const game_params *params, float *x, float *y)
-{
-}
-
-static void game_print(drawing *dr, const game_state *state, int tilesize)
-{
-}
-
 #ifdef COMBINED
 #define thegame untangle
 #endif
@@ -1479,7 +1456,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     true, solve_game,
-    false, game_can_format_as_text_now, game_text_format,
+    false, NULL, NULL, /* can_format_as_text_now, text_format */
     new_ui,
     free_ui,
     encode_ui,
@@ -1498,8 +1475,8 @@ const struct game thegame = {
     game_flash_length,
     game_get_cursor_location,
     game_status,
-    false, false, game_print_size, game_print,
+    false, false, NULL, NULL,          /* print_size, print */
     false,			       /* wants_statusbar */
-    false, game_timing_state,
+    false, NULL,                       /* timing_state */
     SOLVE_ANIMATES,		       /* flags */
 };