ZZT

ZZT is an action-adventure puzzle video game developed by Potomac Computer Systems and released for MS-DOS in October 1991. The game was designed by Tim Sweeney and took roughly nine months to develop, including the game's scripting language, ZZT-oop. The name was thought to be an acronym for "Zoo of Zero Tolerance", but Sweeney actually picked that name so it would be listed last alphabetically on the software catalog. ZZT was followed by a sequel, Super ZZT, in 1992.