Play as Spike Jr.
Complete the game with Butch to get Spike Jr.
Play as Tuffy
Complete the game with Spike Jr. to get Tuffy.
Play as Duckling
Complete the game with Tom or Jerry to get Duckling.
Play as Butch
Complete the game with Duckling to get Butch.
Play as Spike
Complete the game with Tuffy to get Spike.
Teamplay mode
Complete the game with Spike to get teamplay mode.
Unlock Everything
At the main screen hold L and press C-left, C-right, L, C-up, Start.