Cheat: Crystal Sword
During gameplay, press DOWN on the Right Analog Stick + UP on the C-Sick, A, X, B, Y
Easter Egg: Giant Chicken Attack
Enter the first town of the game and slash one of the chickens with your sword. It will turn into a giant chicken and attack you.
Unlockable: Backgrounds
Complete the game on Normal difficulty.
Unlockable: Models
Complete the game on Hard difficulty.
Unlockable: Sketches
Complete the game on Easy difficulty.