Sonic 1 Definitive
► Play Now!

Sonic 1 Definitive


Sonic 1 Definitive is a hack named by RadiantNexus Team, which seeks to reimagine Sonic 1 by rearranging levels. remixing music, adding features from future games, and readding scrapped ideas in new and interesting ways.

Major features:

  • 3 acts of reimagined level design, including one act that has yet to be fully reimagined in any other hack.
  • A miniboss.
  • Massive art overhaul all over the place.
  • Music made by ProjectFM and MechaKnuckles.
  • Menus!
  • A custom splash screen.


  • Inferno: Director, main coder, level designer.
  • BladeOfChaos, ManiacShard: Main artists.
  • MrLordSith: Some art, pre-rendering.
  • Rivet: Secondary coder, responsible for menus and splash screen, hardware testing.
  • MCTravis: Sound porting, beta testing, hardware testing.
  • RandomName: Help with Sonic 3 level layout format.
  • ProjectFM: Music, object and ring managers.
  • MechaKnuckles: Music.
  • NatThePorcupine: GHZ grass.
  • KrazeeTobi: Beta testing, archiving.
  • Somario: Beta testing.

As always, good luck and Have Fun!

How to Play

Player 1 (Default Mapping)
Inside The Game Your Keyboard
A, B, C Button =[J],[K],[L]

How to Save: Hover over the game canvas. A save button will appear at the top of the game screen. When you click "Save" button, the save code (spot) will be saved onto your browser's storage system automatically.

How to Load: Come back anytime in the future, simply click "Load" to resume from your latest save spot. (Assuming you did not clear your browser' data.

CAUTION:: Browser's private mode WILL NOT retain your save state, because save state is deleted once the browser is closed, so don't use private mode if you want to use the save state.

Recommended Browser: Chrome

Sonic 1 Definitive is a Sonic Game you can play online for free in full screen at KBH Games. Play Sonic 1 Definitive using a online Sega emulator. No download or installation needed to play this game. Hope this game bring a little joy into your daily life.