Unlimited ammunition:
Press B , X , B , Y , A , X , A, A buttons at the title screen
to get infinite ammo.
Unlimited health:
Press A , B , A , Y, Y, X , B , Y buttons at the title screen.
If you or a CPU die, your health bar refill to the maximum.
Unlock all arenas:
Press Y , B , Y, Y, A , X , B , X buttons at the title screen
to get access to all arenas.
All clothes:
Press B, B, A , X , B , Y , A , B buttons at the title screen
to get access to all cosutmes.
Unlock characters:
Play with Butch: Finish challenge mode with Tyke.
Play with Ducking: Finish challenge mode with Nibbles.
Play with Eagle: Finish challenge mode with Duckling.
Play with Lion: Finish challenge mode with Butch.
Play with Nibbles: Finish challenge mode with Spike.
Play with Spike: Finish challenge mode with Tom.
Play with Tyke: Finish challenge mode with Jerry.
Play with Monster Jerry in multi-player mode:
Finish challenge mode with Lion.
Play with Robot Cat in multi-player mode:
Finish challenge mode with Eagle.
