You can play Sonic.io free online free games at Cool Sport Games. It has tags: .io,2d,Avoid,Html5,Sonic. It has 151 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, Nightmares the adventures 4 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.