Play Contra Games on Emulator Online. We have the best Contra games online for different retro emulators including GBA, Game Boy, SNES, Nintendo and Sega. There are over 12 online Contra games in our collection. All of the games that you see here are without download, pick any and start playing right away. If you enjoy the game, be sure to vote for it and leave a comment. Contra games that started it all back in the day are now playable free within your browser! Start by playing some of our popular Contra online games like Contra, Contra 3: The Alien Wars, Contra: Hard Corps and Contra Force.