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CHEATS
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NOTE: You must enter the codes very fast!!

Start a game and pause it. Then enter C-UP, C-DOWN, C-LEFT, C-RIGHT.
The cheat menu should now appear.

Invincibility:                 C-LEFT, C-RIGHT, C-DOWN
Level select:                  C-LEFT, C-LEFT, C-RIGHT, C-RIGHT,
                               C-DOWN, C-UP
Kill all visible enemies:      C-DOWN, C-UP, C-LEFT, C-LEFT
Full health:                   C-LEFT, C-UP, C-DOWN, C-DOWN
Clipping (walk through walls)  (20x) C-UP, C-DOWN


Now you can enter the following codes at the submenu "collect".

All puzzle items:   C-UP, (3x)C-LEFT, C-RIGHT, (2x)C-DOWN
All artefacts:      C-UP, C-RIGHT, C-DOWN, C-UP
All keys:           C-DOWN, C-UP, C-LEFT, C-RIGHT
All weapons:        C-RIGHT, C-UP, C-DOWN, C-DOWN