Offline A No-Go
More HD footage of Sonic Runners has gone up. We have also learned that the game is unplayable if you are not connected to the internet or the servers are down. It is basically online DRM according to folks the Sonic Retro forums, a standard tradition with SEGA mobile games. The game’s data are stored on the servers in an effort to prevent cheating.
— Dean Veritiero (@ShaddixLCroft) February 26, 2015
As for the footage you can watch it below.