F10-E - End level
F10-G - Invulnerability
F10-I - 99 ammo, all keys and items
F10-J - press and mouse and you can fly
- - no clipping, but you die, if you leave the level
F10-W - Warp to any level
F10-Z - Background turns grey and all secret ways will be visible
F10-D - Records a demo, pressing + again will save the demo.