Play Mario Games on Emulator Online. We have the best Mario games online for different retro emulators including GBA, Game Boy, SNES, Nintendo and Sega. There are over 49 online Mario 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. Mario games that started it all back in the day are now playable free within your browser! Start by playing some of our popular Mario online games like Super Mario World, Super Mario Advance 4, Super Mario Bros 3 and Super Mario Bros..