Play Action Games on Emulator Online. We have the best Action games online for different retro emulators including GBA, Game Boy, SNES, Nintendo and Sega. There are over 1,159 online Action 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. Action games that started it all back in the day are now playable free within your browser! Start by playing some of our popular Action online games like Grand Theft Auto Advance (GTA), Pokemon X and Y, Pokemon Fire Red Version and Ultimate Mortal Kombat Trilogy.