Open Sonic is an open-source game based on the "Sonic the Hedgehog" universe. It introduces a different style of gameplay called cooperative play, in which it's possible to control 3 characters simultaneously. Unlike most similar games, Open Sonic provides a greater level of interaction between the player and the levels. It's more than just a jump'n'run; the user must come up with some strategy in order to get through the levels.

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Disclaimer: This is a fan-made project based on SEGA’s Sonic the Hedgehog franchise. All rights to Sonic and related characters belong to SEGA. This game is provided for free as a tribute to the original work. This project is not officially approved by SEGA, but falls under their tolerance policy for non-commercial fan games.