One of the major exclusive games for the Apple IIgs was Alien Mind, by programmer Robin Kar and artist Matt Crysdale. The game originally came on 2 protected 3.5″ disks using a non-standard format which fit 920K on a disk (Apple’s standard format fit 800K). There’s a common crack by a French group called...
wherein R. Belmont uses MAME to alter a known crack for PBI Software's "Alien Mind" on the Apple IIgs.