Sonic.io is a terrific unblocked game that you can play here on AvioGames.com in your browser, free of charge. It has been played by hundreds of people and has received a rating of 62 out of 100 by 11 votes. This addicting game is built with HTML5 to run fast in all modern browsers. One of the many advantages about playing Sonic.io on Avio Games is that it is available in full-screen mode to get the full experience. If you liked it, also play our other arcade games or Angry Worms and Excite Bike.