Play Contra Games on Emulator Online. All the best Contra games online for different retro emulators including GBA, Game Boy, SNES, Nintendo and Sega. There are many online Contra games in the 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 within your browser! Start by playing some popular Contra online games like Contra, Contra 3: The Alien Wars, Contra: Hard Corps and Contra Force.