Dear Maintainer,
Attempting to run purity tests in the more traditional way ("purity list"; "purity nerd"; &c) fails with the unhelpful "error opening datafile '$test'" (for any given $test). Running under strace reveals that the program is searching under /usr/games/lib/pt/, when of course the tests actually reside at /usr/share/games/purity instead.
One can still access tests by specifying their full path ("purity /usr/share/games/purity/nerd"), so the package isn't entirely unusable, but this is still a major obstacle.