Stephens wrote Killer Gorilla at the age of 17 after buying a magazine with screenshots of Donkey Kong.

[1] The game involves controlling a man to reach a fair-haired heiress trapped by a large gorilla at the top of the screen.

[2] The game appeared on a number of compilations including 10 Computer Hits (1985), Micropower Magic 2 (1986) and Superior Software's highly regarded Play It Again Sam 3 (1988).

Based on Donkey Kong Junior and originally released as Zany Kong Junior in 1984, it was soon withdrawn after a cease and desist from Atarisoft, who owned the home computer rights to the original game.

Ironically, Atarisoft had commissioned Adrian Stephens to officially port Donkey Kong Junior to the BBC Micro after seeing Killer Gorilla, but the game was never released as Atarisoft decided to abandon the BBC platform.