King of Fighters '98
"Real Bout 2" Andy or Billy:
At the Character select screen, hold START and choose Andy or Billy
to access their "Real Bout 2" versions.
Secret Characters:
For the Orochi Team (Evil Chris, Evil Shermie, Evil Yashiro): Hold
'start' and press any button on the normal team (Chris, Shermie,
Yashiro).
For King Of Fighters '94 art of fighting characters (Ryo, Robert,
Yuri): Hold 'start' and press any button on the art of fighting
characters.
For Real Bout 2 characters (Mai, Terry, Andy, Billy): Hold 'start'
on the respective characters and press any button.
For King Of Fighters '95 style Kyo: hold 'start' on Kyo and press
any button.