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Game: Zero 4 Champ Doozy J
Console: Playstation 1

Cheat:

Always get 777 on slot machines

Pause the game while the slot machine is spinning and press Up, L1, Select.

View development staff

At the title screen, press Down + L1 + R1 + Circle.

Sound novel mode

Enter "NOVEL" as a first name and "SOUND!" as a last name.