|This location exists primarily or exclusively within the Sonic Boom continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
- Not to be confused with Seaside Island (alternate dimension).
During Eggman and his Octopus Bot battle with Team Sonic on the island, Knuckles got sent to the Sonic Boom World by Octopus Bot by accident. Fortunately, Knuckles returned in time to help Sonic when he was corned by Crab Bots.
- Seaside Coast
- Sonic's Shack