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Dreamcast - Jojos Bizarre Adv. Heritage for the Future cheats

Change title screen
Unlock all secret characters and modes

Alessi mode (Heritage For The Future)
Finish challenge mode with Alessi

Unlock Young Joseph (Heritage For The Future)
Finish challenge mode with Joseph

Unlock Evil Dio (Heritage For The Future)
Finish challenge mode with Dio

Unlock Lover Soul (Heritage For The Future)
Finish challenge mode with Jotaro

Unlock alternate Holhorse (Heritage For The Future)
Finish challenge mode with Holhorse

Unlock alternate Kakyouin (Heritage For The Future)
Finish challenge mode with Kakyouin

Unlock Karn (Heritage For The Future)
Finish challenge mode with Anubis Nitoutruu Polunaref

Kid mode (Jojo's Bizzare Adventure)
Beat at least 16 characters in survival mode 

Unlock Young Joseph (Jojo's Bizzare Adventure)
Finish arcade mode with Joseph

Unlock Dio (Jojo's Bizzare Adventure)
Finish arcade mode with Jotaro

Unlock Evil Dio (Jojo's Bizzare Adventure)
Finish arcade mode with Dio