Unstoppable Sonic falls into the dangerous world of a little plumber Mario. On the one hand - it's exciting and fun, but on the other - Mario universe is full of problems and dangers. Sonic, you must be very careful. Of course, passing intricate platform, Sonic will try to collect the coins and the coveted favorite fungus, increasing its capabilities. But, try to stop Mario hedgehog roam free in an online game. Seeing Mario - keep him in further. In addition, dangerous bugs and flowers and toothed waiting Sonic to stop him out of the unpredictable world of Mario.