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Playstation 2 - Konjiki no Gashbell: Yuujou Tag Battle cheats

Random character: 
Press Down at the character selection screen. 

Unlock bonus music: Collect 50 Cards. 
Unlock bonus dialogue: Collect 100 Cards. 
Unlock bonus sound effects: Collect 150 Cards. 
Get more BGMs: Collect 50 Cards

Unlock Zeon as playable character: 
Finish level 1 in mission mode with all characters.