To complete the Radican Highway quests, you must do three tasks in Sonic Speed Simulator. Doing so will reward you with 5x Dark Chao, 5x Doom Trail, and the Doom Shadow character.

A fan favorite, Shadow the Hedgehog also makes an appearance in Sonic Speed Simulator. You can unlock him for free by following this guide, and in no time you'll be gliding around Green Hill Zone ...

Keep in mind that Sonic Speed Simulator redeem codes are subject to expiration. Therefore, we recommend that you redeem them as soon as possible. Update: We checked for new codes on December 16, 2024.

Unlocking Shadow in Sonic Speed Simulator The Release Shadow mission banner (Image via Roblox) The basic variant of Shadow the Hedgehog is free to unlock once you reach the Lost Valley Zone.