Numpad 1: Unlimited Health
Numpad 2: Easy Kills
Numpad 3: Unlimited Rewinds
Numpad 4: Add Upgrade Point
Numpad 5: Freeze Challenge Timer
Numpad 6: Save Position - probably best used before trying big jumps
Numpad 7: Teleport - at the start of non-recoverable fall, press to get back
Numpad 8: Undo Teleport
Numpad 9: Freeze Enemies - enemies can attack but will stay put