Use numberpad to activate cheats: Press both 6 and 5 twice then Hold 6 and 5 down and choose a number to confirm Cheats are activated. Feel free to release 6 and 5.

Note: To my knowledge number 3 doesn't work. 7 doesn't have a key associated with it.

The various numbers on your keyboard can be used as cheat codes:

• 0 = Enable mouse cursor on screen
• 1 = Heals Fifo.
• 2 = Kills Fifo.
• 3 = Toggles Immortality.
• 4 = Disables AI.
• 5 = Swaps between current level's checkpoints.
• 6 = Spawn random enemy.
• 7 = N/A
• 8 = Unlock all skills.
• 9 = Spawns hoards of various enemies.
• Shift + \ = Fly Backwards (In/out of bounds)
• \ = Fly Forwards (In/out of bounds)

Other Useful Keys:

• i = invert Y Camera
• (Asterisk) = Enable/Disable VSync Count
• p = Pauses game.
• m = Takes you to the main menu.
• n = Reloads current level.
• shift + b = Takes you to the last level (in chronological order)
• b = Takes you to next level (in chronological order)

NOTE:

Cheats could crash the game Cheats are not valid for speedruns except for Cheat%.