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Playstation 2 - Twisted Metal: Black - Online cheats

Ingame chat
While you are in the waiting room, press 
L1, R1, L2, R2, L1, R1, L2, R2, L1, R1, L2, R2, L1, R1, L2, R2, L1, R1. 
Sound will confirm the code entry. Press Square inside any game's waiting 
room, to open or leave chat. Press Triangle to exit the chat.