where to find the costumes:

That sinking feline level costumes:
Tom's sailor suit
Jerres sailor suit

scrape yard scrape up level costumes:
for spike a devil dog costumes (i think its there)

luncheons and dragons costumes:
toms muskateer suit
jerries mousekateer suit
duckies hunting suit

unfurgiven level costumes:
toms cowboy suit
spikes cowboy suit
nibbles indian cheif suit

towering inferno suits:
butches construction suit

snow fight level costumes:
jerries snow suit

sandy paws level costumes:
toms swin suit (y would a cat swim?)
butches swim suit
ok thats all of them!
Sent in by: Tomis

Unlimited health:  Press A, X, A, Y(2), B, X, Y at the title screen. Once you or a CPU dies, your/their health bar replenishes to the maximum.

Unlimited ammunition:  Press X, B, X, Y, A, B, A(2) at the title screen.

All arenas:  Press Y, X, Y(2), A, B, X, B at the title screen.

All costumes:  Press X(2), A, B, X, Y, A, X at the title screen.

Play as Butch:  Successfully complete challenge mode as Tyke.

Play as Ducking:  Successfully complete challenge mode as Nibbles.

Play as Lion:  Successfully complete challenge mode as Butch.

Play as Nibbles:  Successfully complete challenge mode as Spike.

Play as Spike:  Successfully complete challenge mode as Tom.

Play as Tyke:  Successfully complete challenge mode as Jerry.

Disable Robot Cat:  Successfully complete challenge mode as Lion.

Secret courses:  On tournament or quick game modes, go to team battle and place players one, two, and three on team "A" and player four on team "B". Choose these players.. First Spike, then Tom, then two Jerrys. You will now have access to the Some Like it Hotter and Raging Mouse courses. If you want to play these again, repeat the steps. Note: All players have to be human (four controllers used).

Secret weapons:  On Lungens And Dragons, hit anything that can be destroyed. When it says "Map destroyed", look for the sword in the rock to find the secret weapon. The same can be done on all levels for different weapons. Note: If you use Jerry, Nibbles. or Tom, you may get a costume on Lungens And Dragons. On the western level, you can unlock a costume with Tom, Nibbles, and Spike.

Unlimited lives:  Press Right(2), Up, Left, Up, Right, Down , B , A , Select, Start(2) at the title screen. This code has been reported as inaccurate. Please submit any corrections or verifications.