Invincibility Player 1:
 801E93AE 008C

Invincibility Player 2:
 801E954E 008C

Infinite Lives Player 1:
 801E93A0 0005

Infinite Lives Player 2 (Note 1):
 801E9540 0005

Infinite Mega-Bombs Player 1:
 801EB6BC 0005

Infinite Mega-Bombs Player 2:
 801EBD5C 0005

Note 1: the game will automatically start in two player mode if this code is selected.