Bio Force Ape (NES)

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Level Select

At the title screen, hold A+B on Controller 2 and one of these buttons on Controller 1, then press Start to go to the specified level.

CodeEffect
ASkip to Level 2.
BSkip to Level 3.

Sound and music test

While on the copyright screen, hold the A and B buttons. This will access a sound and music test screen. The left and right buttons cycle through sound effects. The up and down buttons cycle through music. You can't exit this sound test without restarting the game.