Simultaneous 2-player co-op is not supported on the 3DS Virtual Console version. Core Gameplay Mechanics
Unlike the original hardware, the 3DS version supports Restore Points (Save States) , allowing you to save your progress at any moment—a critical feature given the game’s notorious difficulty. Contra III: The Alien Wars 3DS CIA (VC-SNES) (R...
This port is a spot-on emulation of the original SNES ROM, maintaining original details including the "Mode 7" overhead stages and even occasional slowdown during large explosions. Simultaneous 2-player co-op is not supported on the