Based on a modified version of the DOOM engine, Chex Quest was originally included on free promotional CDs with Chex brand cereal. Surprisingly, this game is actually decent, with fairly good graphics and sounds (not too surprising, given its DOOM-based engine). Although it's fairly short (only five levels) its surreal atmosphere makes it worth trying out. (Thanks goes to "doowopman" of The-Underdogs for repacking this game for easy online distribution.)