Commonly known as "Cat Mario", Syobon Action is a 'masocore' parody of Super Mario Bros., featuring an anthropomorphic cat. The game deliberately subverts many of the mechanics that one would expect to find in a platformer. Players must use trial and error to figure out how to pass the game's myriad traps.
It was re-released as an open-source version for Windows and AmigaOS, under the name Open Syobon Action.