Cheat Mode:
Pause the game. Hold R and press Down, Up, Square, Triangle, Triangle, Circle, Down, Up, Square and Triangle. Now when you pause the game a cheat menu will appear with invincibility and all weapons options.
E-Z Money:
Rescue the farmers in the Haunted Ruins level, and they will lead you to a stash of gold. Save and reload the game, and the gold is back for the taking. Repeat as desired.