Ready 2 Rumble: Round 2 (Nintendo 64)
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Fat Boxer
At the Character Selection screen, press Right, Right, Up, Down, Right, R, R, L.
Huge Gloves
At the Character Selection screen, press Left, Right, Up, Down, R, L.
Skinny Boxer
At the Character Selection screen, press Right, Right, Up, Down, Right, R, L.
Zombie Boxer
At the Character Selection screen, press Left, Up, Right, Down, R, R, L.