Sonic Speed Simulator for Roblox adds new characters every other update, and Knuckles the Echidna wraps up the classic character roster nicely.

Red Star Rings are the main currency of Sonic Speed Simulator on Roblox. They are used for everything from fusing Chao and Trails, purchasing and leveling up Characters, getting sets of your ...

What Can Super Shadow Do? Upon collecting all seven Chaos Emeralds, characters from the Sonic franchise can go Super.

The Sonic x Shadow Generations update in Sonic Speed Simulator brings a new Radical Highway world where you can complete multiple quests for rewards.