ONLINE
Sonic 2 with friends, right in your browser. Run the zones together, race to the goal ring, battle in the PvP arena and meet everyone in the lobby.
Sonic Online runs on your own copy of Sonic the Hedgehog 2 (2013 / Retro Engine). Pick its Data.rsdk file (about 100 MB), or the APK of the Android version. It stays in this browser and is never uploaded.
Sign in, or create a free account (a confirmation e-mail is sent). Google works too.
Keyboard or gamepad. Works best in Chrome, Edge or Firefox on a computer.
Free fan project · plays in your browser · needs your own copy of Sonic 2 (2013)
Arrows: move · Z / X / C (W / X / C on AZERTY): jump · Enter: chat · Escape: menu · F11 or the button: fullscreen
Every zone of Sonic the Hedgehog 2, playable with up to 8 players, with a shared lobby, levels, rings to spend and leaderboards.
Play Sonic 2 from Emerald Hill to the Death Egg in one run with your friends, zone after zone like the original game. Three lives each: lose them all and you watch your teammates, then come back when they clear the zone. Beat the final boss together, and a gold star appears next to your name for good.
A big Emerald Hill lobby with an island for every zone, leaderboards, chat and parties of friends.
Clear the zones as a team (enemies, rings and bosses are shared) or race your friends to the end. Time attack for record chasers.
Up to 8 players. Spin into your rivals to make them drop their rings: the last one standing wins. Find opponents, or play a friendly match with your party.
Bank your rings, level up and unlock characters in the shop: Tails and Knuckles, and now Mighty, Ray, Amy, Espio, Fang, Tikal, Vector, Cream and Rouge, with their own powers (Mighty's hammer drop, Amy's hammer, Fang's popgun, Tikal's mid-air punch, flight for Ray, Cream and Rouge) and colour variants for everyone.
Found the stars of a checkpoint? Invite the players of your act and run the half-pipe together, with the team's rings counted together. Each Chaos Emerald gives a permanent bonus on the rings and experience you earn.
A wider view than the original, in a window, a borderless window or fullscreen.
From Emerald Hill to the Death Egg: finish a zone to unlock the next one.
Three steps, right here in your browser.
At the top of this page, choose the Data.rsdk file of your own copy of Sonic the Hedgehog 2 (2013 / Retro Engine), or the APK of the Android version. Your browser keeps it: you only do this once.
Create an account (a confirmation e-mail is sent) or use Google.
Press Play now. See you in the lobby! New versions arrive by themselves: the page simply reloads.
Questions, teammates, bug reports, new versions: join the community on Discord.
Sonic Online stands on the shoulders of these people.
Christian "Taxman" Whitehead and Simon "Stealth" Thomley, published by SEGA. Retro Engine (RSDK) by Christian Whitehead.
Rubberduckycooly and st×tic — RSDKModding/RSDKv4-Decompilation. Not our code: used under its license (non-commercial, credited).
Mighty and Ray: sprites from Sonic Mania (SEGA, Christian Whitehead, Headcannon, PagodaWest Games, Hyperkinetic Studios), sheets from The Spriters Resource. Fan-made sprites (The Spriters Resource, Custom / Edited): Amy Rose by E-122-Psi; Tikal by SunnyVies; Fang and Vector by Akimaco; Cream & Cheese by FroggyMudd; Rouge by Zig Sonar; Espio by Geo the Fox, Deebs, Tanuke, Radth, Silverbolt, Skylights and others. Thanks to all of them.
Online mode, lobby, arena and servers. Libraries: SDL2, libogg, libvorbis, Emscripten (WebAssembly). Sign-in: Keycloak.
Sonic the Hedgehog and all related characters, music and artwork are trademarks and copyrights of SEGA. Sonic Online is a free, non-commercial fan project, not affiliated with or endorsed by SEGA, and contains none of the game's data: you need your own copy of the game. By creating an account you accept the rules and the privacy policy.
