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When you have inserted your coin enter the following codes to unlock the corresponding effect.
Unlock Big Pieces:
Press Left(x4), Down, C, B, A.
Pieces Drop Quickly:
Press Down(x8), C, B, A.
Pieces Rise from Bottom:
Press Down, Up(x2), Down, C, B, A.
Unlock Black and White Mode:
Right(x3), Up(x1), C, B, A.
Display TLS Mode:
A, B, C, C, B, A, A, C, B.