Effect Code Debug Mode At the Title Screen, press Down, Up, Down, Up, Right, Down, Left, Down, Up, Down. Then, press R2 to enter the Debug Options during play.
Original Game Mode
Effect Code Secret Areas will appear on 20, 30, and 50 At the title screen press Right, Left, Up, Down, Up, Down, Up
Thunder Bubble Glitch
At the Title Screen, do the debug code [which are Down, Up, Down, Up, Right, Down, Left, Down, Up, Down]. During the game, press the R2 to go to the Debug Menu. Go to map 63 and then press the L2 button. This teleports you to stage 100, where there are Thunder Bubbles. Press the R2 button again and then go back to map 0 and press the L2 button to go there. The Thunder Bubble icons will follow you to the beginning.
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