The player's Roblox avatar is unlocked by default, but by completing Quests, collecting cards, redeeming codes, purchasing or meeting requirements during specific events, the player can unlock additional characters from the Sonic series, such as Sonic, Tails, Knuckles, Amy, and several variations of them. Sonic Speed Simulator is a 3D, third-person incremental platformer game that features open worlds and multiple playable characters. Sonic grinding down a Grind Rail in Green Hill, the first world in the game.
