Play Sonic Games on Emulator Online. All the best Sonic games online for different retro emulators including GBA, Game Boy, SNES, Nintendo and Sega. There are many online Sonic 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. Sonic games that started it all back in the day are now playable within your browser! Start by playing some popular Sonic online games like Sonic Mania Edition, Sonic Advance 3, Sonic the Hedgehog 3 and Sonic Battle.