Its absence was breaking the icon build on Ubuntu 14.04, because you
ask convert to map an image into a specific 16-colour palette, and it
does so and _then_ nonconsensually maps those colours in turn through
a colourspace transformation you didn't ask for, causing icon.pl to
fail an assertion when it finds an RGB value not in the palette.

Based on a web game I saw a few years ago, and dashed off this weekend
after I thought of a way to write a good (though not quite optimal)
heuristic solver, here's a random little thing not quite in the same
line as the most usual kind of Puzzles fare: instead of making you
scratch your head to find any move to make at all, it's easy to find
solutions in principle, and the challenge comes from having to do so
within a move limit.

[originally from svn r9797]
[r9795 == 3fc5a644a72e747b1f88125b38b2f178a9bc7ed3]

implementation of a puzzle usually called 'Tohu wa Vohu'.

[originally from svn r9680]

'Haunted Mirror Maze', a game involving placing ghosts, zombies and
vampires in a grid so that the right numbers of them are visible along
sight-lines reflected through multiple mirrors.

[originally from svn r9652]

in the 'unfinished' directory for a while, and has now been finished
up thanks to James Harvey putting in some effort and galvanising me to
put in the rest. This is 'Pearl', an implementation of Nikoli's 'Masyu'.

The code in Loopy that generates a random loop along grid edges to use
as the puzzle solution has been abstracted out into loopgen.[ch] so
that Pearl can use it for its puzzle solutions too. I've also
introduced a new utility module called 'tdq' (for 'to-do queue').

[originally from svn r9379]

puzzle variously known (depending on which website you look at) as
Kurodoko, Kuromasu or 'Where is Black Cells'.

[originally from svn r8996]