The King of Fighters '98 Cheats

At the Order Selection Menu press Select to choose your level.

Press L1 on Chris, Yashiro or Shermie and you´ll get the Orochi versions of those characters

Earn at least 100,000 points in the third round before knocking out the computer, earn at least 100,000 points in the fourth round before getting a perfect knockout or win all fights rounds one through five without losing any teammates.

To select the EX versions of a character, highlight them at the character select screen and press and hold Start. If their portaits change, they have an EX version, if not, then they don't. (Kyo, Iori, Chizuru, Heidern, Saishu, Takuma are some of the characters who don't have EX Versions.)

At the Character Selection screen hold L1 and press any button to get a different character.