The King of Fighters '98 Ultimate Match Cheats
Complete the game in one player mode as Rugal on any difficulty setting. Save the game, then load that file. Then, hold Start while choosing Rugal at the character select screen.
Press Select at the order select screen.
Highlight the normal version of one of the fighters below at the character select screen, then hold L1 and press any button:
Evil Rugal Berstein
Real Bout 2 Terry Bogard
Real Bout 2 Andy Bogard
'94 Joe Higashi
'94 Ryo Sakazaki
'94 Robert Garcia
'94 Yuri Sakazaki
Evil Yashiro Nanakase
Real Bout 2 Mai Shiranui
Real Bout Bout 2 Billy Kane
Highlight the survival mode option, then hold Start + Triangle and press Circle.
Collect over 100,000 points before knocking out the CPU fighter in rounds three or four. The round four knockout must be a perfect victory. Or, beat all CPU opponents without losing any team members from rounds one through five.