You can play Sonic.io free online free games at Cool Sport Games. It has tags: .io,2d,Avoid,Html5,Sonic. It has 154 total plays and has been rated 0% (1 like and 0 dislike), find the fun and happy day. We find some of the game: Sonic Extreme 2, Sonic.io, Soccer Balls and Final Fantasy Sonic X1. To play other games, go to the .io games page, the 2d games page, or just check out the new games or best games page.