Sonic Speed Simulator

The player walks around and collects Chaos Orbs and rings around a world (map). While walking around gives them XP, collecting Chaos Orbs gives more XP to help them level up, which then increases their speed and jumping power. The maximum XP earned per level increases with the level. Other ways to earn XP are by running and jumping through Sky Rings, completing quests and Time Trials (challenges that involve passing through spawned checkpoints and reaching the goal within a world as fast as possible), and buying from in-game shops. At any time, the player can rebirth, which resets the player's speed, power, and level, but returns Skill Points, which can be used to buy permanent upgrades.

Initially, the player's character is their Roblox avatar, but they can obtain Sonic characters to play as by completing Quests and limited-time event objectives, collecting cards, redeeming codes, and purchasing them for a limited time. Trails and pets, which give upgradeable benefits, are obtained through spending rings on vending machines and completing Quests, event objectives, and Time Trials. Trails and pets can be leveled up at Upgrade Machines with rings, Red Star Rings, or both, and identical ones can be fused together into "Evolved" forms. To unlock the next world, the player must earn five Gate Keys from Quests.

Sonic Speed Simulator was pitched by Joe Ferencz, the CEO of Gamefam, to Ivo Gerscovich, Sega's chief brand officer (CBO) for Sonic the Hedgehog. Ferencz sought to develop an official Roblox game for a major video game franchise. At the time, Sonic the Hedgehog had less popularity among younger audiences and Sega was looking for ways to raise it, such as with the 2020 Sonic the Hedgehog film. Ferencz pitched with the expectation that the film would leverage Sonic's popularity, and Gersovich took it as an opportunity to connect the Sonic brand with Roblox's young player base.

The game was announced and released in closed beta on April 13, 2022, requiring 50 Robux for access to play, before being fully released as free-to-play three days later on April 16, 2022. The game had 70 million plays and 275,000 concurrent users in the first week of its release, which made its launch Roblox's largest. It went on to reach 500 million visits in its first four months. Joe Ferencz described it as "the No.

Alan Wen's review on Eurogamer was positive and praised the 3D, open-world gameplay, stating that Sonic Speed Simulator is "probably the most polished experience to have graced Roblox so far", but criticized the progression, obstacle courses, and race minigame, finding the progression to be unsatisfying and race minigame as too basic and lag-inducing.