Sonic Frost

Storyline

After the events of Sonic 2's good ending, Sonic and Tails decide to relax but it turns out they get a letter from Dr. Robotnik inviting them to Northern Island, and when they arrive, they see the place has been turned into a Winter wonderland! It's up to Sonic and Tails to take down Eggman and restore the Island to it's original state.

Source: IGDB