Batman

Unlimited continues:
Press Up(2), Down(2), Left, Right, Left, Right, A + B at the title screen.

Sound test:
Press Up/Right + Start at the title screen.

Defeat moth Boss:
Pause game play and press B, A, B and A. The moth will fly away when the game is resumed.

Unlimited power-ups:
Locate the falling drop claws, then crouch next to where they are landing. Face the claws and repeatedly punch in this direction. Each defeated claw will transform into a power-up. Use the pattern that the claws are falling to collect the heart, weapon bonus, or extra points before returning into position to hit more claws.