Play Sonic And The Mystic Gems online

Sonic And The Mystic Gems
Play Sonic And The Mystic Gems ROM hack online here, in web browser for free!

Sonic And The Mystic Gems (previously known as Sonic 1 Harder Levels) is a hack made by Eduardo Knuckles and his team Harder Project of Sonic the Hedgehog on the Sega Mega Drive/Genesis. Play Sonic And The Mystic Gems online!

Sonic And The Mystic Gems game description

The hack adds to the game a lot of new features such as the three known main playable characters, a checkpoint monitor, customizable level music playlist, a sweet and clear save data select menu, difficulty selection, a unique music menu and some other additional menus and screens which gives to the game a completely new gameplay experience.


Unsatisfied by his last defeat, Robotnik sought for other methods to kick Sonic off his way. While he was looking for the Chaos Emeralds, he found another source of energy which seems to be powerful like those emeralds. This source of power is known as Mystic Gems. As opposite of the chaos emeralds, they have an destructive evil power. If he gets access to these gems he can rule the world. Sonic, Tails and Knuckles now have to prevent Robotnik from find this evil power, so there’s how this new adventure begins. There’s a expert plan to take over South Island with robots and courses, but Sonic and his friends will not let the doctor to conclude it easily.

Will you be capable of helping Sonic to pass from this very difficult adventure? Good luck!!


  • New splash screens
  • Sonic, Tails and Knuckles has new stance animation according levels.
  • An Options menu where difficulty, character and playlist can be choosen
  • Game mode select (Original, Harder and Expert)
  • Game soundtrack (Playlist A, Playlist B, Playlist C and Random playlist)
  • Player Select (Sonic, Tails And Knuckles)
  • Music theater
  • And more…

Play Sonic And The Mystic Gems online!

You can play Sonic And The Mystic Gems online here, in web browser for free! Play all Sonic games here!

Avarage user rating
2.7 /5
Rating breakdown
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