Enter the following codes at the main menu:
Effect Code Arcade Mode B, A, B, A, B, A, Left, C Play as Humans Left, Down, Up, B, Right, C, A Remove background graphics and get new music. A, B, A, B. A, B, Right, C or Left, A, Left, C, Left, B, Left, C Secret Options Left, Right, Left, Right, A, B, C, B Super Game Up, C, Right, B, A, Left, C, Down Turbo Mode Down, A, B, C, Left, Right, Left, C
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