Classic Sonic Simulator V.

Classic Sonic Simulator (CSS) is one of Roblox's oldest and most beloved fan games, created September 2013 by VyrissDev and currently on version 13.2. Players choose from 12 playable Sonic variants, run through 16+ zones with 23+ acts based on actual Sega Genesis, Master System, and Game Gear Sonic titles, and use a built-in level editor to create custom maps. The game is not affiliated with SEGA or Sonic Team. With 164.2M+ visits, 503.2K favorites, and a 86.1% approval rating built over 12+ years, it holds one of the longest active development histories of any game on Roblox. Servers support 100 players.

The core gameplay faithfully recreates classic Sonic movement across zones directly based on the original games, with character variants offering distinctly different move sets:

• 🗺️ 12 Playable Characters - S1 Sonic (no Spindash), CD Sonic (Peel-out and charged Spindash), S2 Sonic (standard Spindash), Knuckles, Tails, and more
• 🗺️ 16 Zones with 23+ Acts - Green Hill, Marble, Spring Yard, Labyrinth, Star Light, Scrap Brain (Sonic 1), Emerald Hill, Casino Night, Mystic Cave (Sonic 2), Collision Chaos (Sonic CD), Angel Island, Mushroom Hill (Sonic 3), Studiopolis (Sonic Mania), and custom zones
• 💎 Character Skins - badge-locked alternate forms including Rose Sonic, Gold Sonic, Dark Sonic, and their Deluxe variants; each requires a specific in-game achievement to unlock
• 💎 Elemental Shields - Fire, Water, and Lightning shields from Sonic 3 available to S1, CD, and S2 Sonic variants
• 🎭 Level Editor - player-created custom maps in supported zones including Green Hill, Marble, and Emerald Hill
• ⏳ Version Updates - 13+ major versions since 2013; v13.2 is current as of November 2025

Unlocking the rarer skins drives long-term engagement. Rose Sonic requires an A rank in Survive the Disasters 2, Ashura Sonic is currently unobtainable pending an event, and Gold Sonic and Dark Sonic each have their own achievement paths. The Fandom wiki at classic-sonic-simulator.fandom.com covers all characters, zones, and skin unlock requirements in detail.

CSS occupies a unique position as a decade-old fan game with generational players. If you enjoy retro-inspired Roblox platformers, this is among the most complete examples on the platform.