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Playstation 2 - Alter Echo cheats

Restore time dilation
While playing the game, enter Up, Up, Down, Down, Left, Right, 
Left, Right then L3 + Up.

Replenish health
During a gameplay, enter Up, Up, Down, Down, Left, Right, Left, Right, 
after L3 + Right.

Get More Plasm
Try to get in as many consecutive hits as you can.