Yu Yu Hakusho: Dark Tournament

Press Circle, Square, Circle, Square(2), Down at the cheat menu.

Bui - Complete Bui's arcade mode.
Elder Toguro - Defeat Younger Toguro in Dark Tournament episode 2.
Hiei - Win a tag team fight against five opponents with Hiei.
Kurama - Complete Kurama's arcade mode
Kuwabara - Complete Kuwabara's training against Kuwabara.
Younger Toguro - Complete Younger Toguro's arcade mode as Yusuke.
Yusuke - Beat Yusuke (CPU controlled) in any mode.

Complete dark tournament episode 30.

Enter at the cheats menu: SQUARE, X, CIRCLE, SQUARE, X, CIRCLE.

At the start of a fight, step back two steps and hold Down while continuously pressing L1. You should keep planting mines on the ground. After planting about seven mines, keep stepping back until your opponent runs toward you. They should die then. This is useful for winning survival mode.