Atic Atac is an arcade-adventure video game developed and published by Ultimate Play The Game, released for the ZX Spectrum and the BBC Micro in 1983. The game takes place within a castle in which the player must seek out the "Golden Key of ACG" through unlocking doors and avoiding enemies. It was Ultimate's second game to require 48K of RAM; most of their previous games for the Spectrum ran on unexpanded 16K models. The game was written by Tim Stamper and graphics were designed by Chris Stamper. Atic Atac received praise from critics upon release, mostly for its graphics and isometric gameplay. It was later included in Rare's 2015 Xbox One retrospective compilation, Rare Replay. The game served as inspiration for the critically acclaimed adventure game show Knightmare.