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