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Playstation - Ranma - Battle Renaissance cheats

Change costumes
Hold L1 + R1 while selecting a character in either Battle mode 
or versus mode.

Sound test
Set the following parameters:
Time limit: 30
CPU level: 1 
Rounds won: 1
Then, choose the story mode and uncover all stones except one. 
Now save and reload the game at regular intervals to avoid mistakes. 
A special red stone will appear to the right of the starting location 
after only one stone remains. Uncover the red stone to go to the 
sound test mode. 

Unlock Rogue as playable character:
Choose the versus mode, then press the following button combinations at 
the character select screen:

For player-1:
Highlight Ranma and push Right, Right, Right, Down, Left, Left, Left, 
Up and any button to play as Ranma. 

For player-2:
Highlight Ranma's friend and press Left, Left, Left, Up, Right, Right, 
Right, Down and any button.