Play Action Games on Emulator Online. All the best Action games online for different retro emulators including GBA, Game Boy, SNES, Nintendo and Sega. There are many online Action 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. Action games that started it all back in the day are now playable within your browser! Start by playing some popular Action online games like Mario Kart 64, Pokemon X and Y, Pokemon Fire Red Version and Super Smash Bros..