Cheat mode:
Hold L1 and press Triangle, Left, Left, Right, Square, Up, Up, Left, Circle at the title screen. Then while playing a game, press L2 + R2 to display a cheat menu.

Unlimited crystals:
Hold L1 and press Square, Square, Circle, Down, Left, Right, Left, Right at the title screen. Then hold R2 and press Square during the game to add one hundred crystals to the current total.

Infinite lives:
Hold L1 and press Circle, Down, Left, Up, Right, Triangle, Down at the title screen.

Beat the gobbo on the trampling:
Get on the tramp next to the gobbo. Do your stomp attack. As soon as you touch the ground and press X. You will do a high jump and beat him. You will get $100.00.

Shortcut on boat race:
Talk to the gobbo next to theriver and jump in his boat and start the race. When you pass by the waterfall, go in it for a short cut and and the red gem.