More Credits: At the title screen, enter the options. Once in the options menu, press Left, Right, R1, R2, L2, L1, Up, Down. A timer will appear, counting down from 30 seconds. Highlight the word "Credits," and tap X rapidly. The more time you press the button, the more credits you get.

Special Stages: At the title screen with the words "Press Start Button" is flashing, press R1, Up, L2, Down. A small green guy will appear in the lower right corner. Start a "Puzzle Game," and you play on new backgrounds.

Play as Other Characters in the One Player Mode: To play as a character other than the little green dragon in the "Puzzle Mode," press the following when you are on the "Start" circle on the main map: Left, Left, Up, Down, then press buttons L1, L2, R1, and R2 simultaneously. A "Character Select" screen should appear. Now you can cycle through the other characters in the game, including enemies from the "1 Player vs. Computer" mode.