Hold START during the credits to see the strongman boss spin across the bottom of the screen.
Level Passwords
Effect
Password
1-1
Y433 43 53B3 73
1-1, w/ an extra life bar.
1111-11-1111-1*
1-1, w/ Invincibility
1995 14 BBBB 51
2-1
D957 65 849B 55
2-2
5958 65 8Y1B Z9
2-2
ZD7! 87 XX9X 28
3-1
X95! 65 BB51 66
3-1, w/ Invincibility
199! 14 BBBB 18
3-2
2D7D XZ Y76B 9!
3-2
8117 61 77D3 23
4-1
1D7Z X7 Y!52 X9
4-2
2D7* X7 Y966 *9
5-1, w/ Invincibility
199* 14 BBBB 89
6-1, w/ Invincibility
1992 14 BBBB 21
6-2, w/ Invincibility
1993 14 BBBB 64
Stage Select
Enter password: Y*31 21 3191 11. Then use controller 2 to select stage.
View Ending Again
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.
Credits Easter Egg...