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Dreamcast - Kings of Fighters Dream Match 99 cheats

Change outfits:
Highlight any of the following characters at the fighter selection 
screen, after hold Start and press A, B, X, or Y:

Andy Bogard
Billy Kane
Joe Higashi
Kyo Kusanagi
Mai Shiranui
Omega Rugal
Orochi Chris
Orochi Shermie
Orochi Yashiro
Robert Garcia
Ryo Sakazaki
Terry Bogard
Yuri Sakazaki

Change costume colors
Highlight any characters at the fighter selection screen, and press
the following buttons:
Normal color: A
2nd color: A + X
3d color: A + Y
4th color: A + X + Y

Full pause screen                                                 
Press X + Y, while paused the gameplay.

Alternate survival mode - Fight individual characters:
Finish the survival mode once. After, highlight the "Survival Mode" 
selection, hold Start and push A