Magazine Publisher:The One no. 29, Feb 1991 (Amiga/Atari ST dual format coverdisk) [downloadHERE].
Based on 1988 Exocet Atari ST release.
Brief Instructions (Amiga/Atari ST Dual Format Coverdisk) [Source: The One 29 (Feb 1991), Page 10]
Press ‘P’ to pause the game and type “0772202997” as fast as possible. If you make a mistake press ‘F’ to unpause the game and start again. If done right the screen should flash to let you know you are invincible.