Title	Label	Cover
Amstrad CPC
	The Graphic Adventure Creator · Cassette · 1985	Incentive
	The Graphic Adventure Creator · Cassette · 1985	Incentive
	The Graphic Adventure Creator · Floppy Disk 3' · 1985	Incentive
	The Graphic Adventure Creator · Floppy Disk 3' · 1985	Incentive
Commodore 64/128
	The Graphic Adventure Creator · Cassette · 1986	Incentive
ZX Spectrum
	The Graphic Adventure Creator · Cassette · 1986	Incentive

Wikipedia

Graphic Adventure Creator (often shortened to GAC) is a game creation system/programming language for adventure games published by Incentive Software, originally written on the Amstrad CPC by Sean Ellis, and then ported to other platforms by, amongst others, Brendan Kelly (Spectrum), Dave Kirby (BBC, Electron) and "The Kid" (Malcolm Hellon) (C64). The pictures in the demo adventure, Ransom, were made by Pete James and the box cover art by Pete Carter.

Credits

CPCPOWER zxdb lemon64 Wikipedia (EN)