If you're looking for the SNES version come to Contra III: The Alien Wars
The gameplay is similar to the Snes game but the structure are altered many of the bosses were removed and the stage 4 is now removed too. A strafing ability was included to compensate for the absence of rotation in both top-view stages, and a password feature was added. The player no longer has the ability to hold two weapons, but can still carry and use Bombs with the Select button. All the weapons from the original SNES game are featured except for the Laser. The game features Super Game Boy support, which also provides a custom color scheme and enhanced sound effects.