Two Nintendo-inspired Zones have been released as DLC for Sonic Lost World, one inspired by Yoshi's Island, and the other inspired by Yoshi's island. You can see full walkthroughs of each zone here: ...

For the longest time, Shadow the Hedgehog was technically a spin-off, but thanks to Sonic x Shadow Generations, I suppose it’s now canon. Shame, since this game ... time, Lost World was stuck ...