During cutscenes between stages (after the first one), while holding down Start on Controller 1 and A+B on Controller 2, press Select on Controller 1. This allows players to start the next stage with 10 extra Batarangs.
After beating the game and watching the ending, while the copyright screen appears, press Left, A, and B on Player 2's controller to see the ending a second time.
Press Left, A, B on Controller 2 on the copyright screen after viewing the ending to replay it.
The game has a hidden points counter to determine the ending the player receives when completing the game. This tally increases every time the player is hit during gameplay, and every time they lose a life. Dying ingame increases the tally signifigantly faster and thus is an easier metric to determine what ending the player will earn when they complete the game.
|Unlockable||How to unlock|
|Worst Ending||Lose ~15 lives|
|Bad Ending||Lose ~10-14 lives|
|Good Ending||Lose ~6-9 lives|
|Best Ending||Lose no more than 5 lives|
Enter Y*31 21 3191 11 in the password menu. You can then use controller 2 to select a stage to start a new game on.
Hold START during the credits to see the strongman boss spin across the bottom of the screen.