Operation C

From Hiscorebob's Hardware & Cheats Collection
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Level select

Press Up(2), Down(2), Left, Right, Left, Right, B, A, B, A, Start at the title screen.

Ten lives

Press Up(4), Down(4), Left(4), Right(4), A, B, Start at the title screen.

Sound test

Press Up, Down, Left, Right, A, B, Start at the title screen.