Cheats for Episodes 1-3

The key combinations need to be pressed at the same time.

[C] [T] [space] - Gives pogostick, all keycards, and full ammo.

[shift] [tab] - Pass through an unplayed level on world map.

[G] [O] [D] - Will put your keen in GOD Mode and will give you a jump cheat.

Cheats for Episodes 4-6

The key combinations need to be pressed at the same time.
Some versions might require pressing [A] [2] [enter] before using cheats.

[F10] [G] - God mode

[F10] [I] - Free items

[F10] [J] - Jump cheat

[F10] [N] - No clipping

[F10] [Y] - View hidden areas in the level.

[F10] [B] - Set border color (1-15)

[F10] [C] - Show number of active/inactive objects in the level

[F10] [D] - Record a demo

[F10] [E] - End the current level

[F10] [M] - Display memory usage

[F10] [S] - Slow motion

[F10] [T] - Sprite test

[F10] [W] - Warp to any level

[F10] [Y] - Reveal hidden areas