You'll need two controllers for this code. While playing the game, plug another controller into the second port. Take the controller back out and quickly enter X (2), Y (2), B (2), A (2) on the first controller. You will hear a sound to confirm.

With cheat mode enabled enter X , Y , A , B , X , Y. Your health will become yellow. (Note: Don't jump into propeller blades with this code. You will lock up the game.)

With cheat mode enabled click-in the Left Analog-stick twice, Right Analog-stick twice, Left Analog-stick twice, Right Analog-stick twice. Do this as much as you want for more money.