Battle Stadium D.O.N Cheats (PS2)

Perform missions and collect some money. After that go to the slot machine. Get three of
the Shonen Jump signs. Then you are going to be taken to the bonus slot machine mini-game.
Get three of the heads that have a "?"(question mark) on them to unlock a character. The
characters written below can be unlocked by defeating them in Story mode of the game, then
playing the slot machine until they are won:

Buu,Cell,Frieza,Gaara,Majin,Buu,Nami,Rock,Lee,Trunks,Ussop