Blockhead

CHEAT MODE 1:
Enter "CALLIGULA" as a password. The screen flashes and "code not found" appears, but both mouse buttons now work during gameplay:
Left mouse button: Level skip
Right mouse button: Bonus game and level skip

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Source: Amiga Future GTT

CHEAT MODE 2:
Score over 1000 points (eliminate the first two grenade launchers, then lose all lives). Enter "RED WIZARDS OF THAY!" as your high score name. In a new game, these keys are active:

F1 - Collision off (you still lose a life in canyons!)
F2 - Collision on
F10 - Refill energy
HELP - Skip level

Freezer Addresses:
Lives: $C0C19D or $C08D3C (replace with $4A)