Diamond Girl is a single player puzzle game with a time constraint (pausable).
During a game, the player moves around inside one or more levels. A level is completed by collecting some number of diamonds, and then moving to the exit.
See also http://en.wikipedia.org/wiki/Boulder_dash
Diamond Girl is licensed under GPL (see the LICENSE file).
Current version is 1.14, released on Fri Apr 6 10:58:57 UTC 2012: diamond-girl-1.14.tar.bz2 (706K) [changelog]
Diamond Girl uses the autotools build system. Try something like the following:
./configure --prefix=$(pwd)/inst && make && make install && ./inst/bin/diamond_girl
Diamond Girl is being developed on Linux, but it might work on other platforms as well. Very old versions were reported to work on AmigaOS4 and MorphOS.