The game is a combination of puzzle and story, combining several different kinds of logic puzzles and word puzzles. The puzzles include variations of
Set,
Black Box, and
Sokoban, as well as many others. The overarching story is an
allegory in which the player and other characters are programs in a broken, dysfunctional computer environment. Originally, Plotkin released System's Twilight as
shareware. Since 2000, it has been re-released as binary-only
freeware. It runs only in the
Mac OS Classic environment, but can be run in
emulation on other platforms. ==Reception==