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Playstation 2 - Hyper Street Fighter 2: The Anniversary Edition cheats

Unlock Akuma:
Go to "Game Speed" option after go to characther screen. Then select "Super X" 
character type. After highlight all the following characters in order, 
exactly two seconds:
Ryu, T. Hawk, Guile, Cammy and Ryu again.
After straight press Start followed by 3 punches.

Unlock the easy and hard mode:
Finish the game once in normal mode