Debug mode:
Press Start to pause game play, then hold L1 + R2 and press Up, Triangle, Down, X, Left, Square, Right, Circle. Press Start to resume game play and press L2 + R2 to display the debug menu at any time. Note: For the Japanese version, press Start to pause game play, then press Up, Triangle, Down, X, Left, Square, Right, Circle, L1, R1, L2, R2. Then press Start to resume game play and press L1 + R1 to display the debug menu.

Carry more items:
Hold Triangle and press L1, R1, Up, Right, Down, Left at the item selection screen to carry up to 30 items.

Increase each item by one:
Hold Triangle and press L1, R1, Up, Down, Right, Left at the item selection screen.

Maximum power:
Press Start to pause game play when having less than full power. Then press L1, R1, Right, Down, Left, Up.

Bonus level:
Successfully complete the game with Rikimaru. The 2030 A.D. level will appear under the time attack option.

Extra languages:
Successfully complete the game to unlock a language selection on the options screen. This allows the dialogue to be displayed in Spanish and French.