Unlock Evil Gamof:
At the character selection screen, highlight Gamof, then press and hold Start + A.
Unlock Kaede:
At the character selection screen, highlight Rain, then press Down, Down, Left, Left, Up.
Unlock Rai-On:
At the character selection screen, highlight Byakko, then press Up, Down, Left, Left, Right, Left, Up.
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Plasma Sword Cheats, Codes & Walkthrough/Guide/FAQ for Dreamcast from Cheat Code Central
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Plasma Sword Cheats at CheatingDome.com.