All Boxers

At the cheat menu press: Start, X, O, Square (2x), R1 (2x), Square, O, X, Start.

Alternate Costumes

At the cheat menu press: Start, X, R1, O, Square, Start.

Always Powered-Up

At the cheat menu press: Start, X, O, X, O, X, O, Square (3x), Start.

Conversation Mode

At the cheat menu press: Start, R1, X, O, Square, R1 (3x), Start.

International Tournament

At the cheat menu press: Start, X (3x), O (3x), Square (3x), Start.

Invincibility

At the cheat menu press: Start, X (2x), O (2x), R1 (2x), Square (2x), Start.

Box Fast

At the cheat menu press: Start, R1 (10x), Start.

Bonus Arena

At the cheat menu press: Start, O, R1, O, R1, X (2x), Start.

All Boxers' Life Meters

At the cheat menu press: Start, X, Square, O, R1, X, Square, O, R1, Start.