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

If you're a fan of the old-school classic Sonic the Hedgehog and looking for a Roblox game that draws inspiration from the same universe, Sonic Speed Simulator is the perfect game.

Roblox players can earn Nine's Mechanical Arms for free by taking part in an event in the Sonic Speed Simulator game.

Here are all working Sonic Speed Simulator codes as of 28th August 2025: Not sure how to redeem codes in Sonic Speed Simulator? Here’s what you’ll need to do: ...