Cheat Codes:

Get your dagger out, throw away any secondary weapon you have, pause the game and enter the code (In the pause screen).

Try to keep an even rhythm (Press up, down once to hear a good rhythm, press again when the sound stops).

NOTE: Sometimes you need to first unlock a Chainsaw for the other codes to work.
NOTE: You don't have to actually complete any modes to *use* the codes.

• Code--(Result)
• Up, up, down, down, left, right, left, right, up, down, up, down (Chainsaw (Gotten by completing Hard mode))
• Up, down, up, down, left, right, left, right, up, down, up, down (Swordfish (Code distributed with premium version))
• Right, left, right, left, down, down, up, up, up, down, up, up, down, down (Telephone of Sorrow (Gotten by completing Medium mode))
• Left, left, right, right, up, down, down, up, up, down (Baby Toy Hammer (I think you get the code from Easy mode))