Unlockables
Unlock Art Gallery:
Finish the game and the Art Gallery will become unlocked.
Unlock Dr. T:
To unlock Dr T start a new one player story mode game and find him.
Unlock Oscar and Mash:
To unlock Oscar and Mash start a new one player story mode game and find them.
Unlock King:
After you have completed the game with every character including Oscar and Mash you will unlock King.
We have more cheats and tips for this game here, One on One cheats
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