GameMaker is an all-in one game creation system for Mac OS 7.5 and up (including Mac OS X), written by Al Staffieri Jr. and first released in 1995. As of August 2011, the software is still under active production; the most recent release is version 3.9.95.As compared with the action-oriented design of the three similarly named game design packages (by Garry Kitchen, RSD, and Mark Overmars), Staffieri's GameMaker is a card-based system, focused on the design of graphical adventure games.