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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The Zip includes windos, linux versions and source code.

Open Sonic is available for Windows and Linux. The latest release is 0.1.4 (September 19th, 2010). Main features:

It’s portable! No installation is required!
Sonic-style physics (360° movement engine)
Available in 9 languages: English, Portuguese, French, Polish, German, Czech, Dutch, Indonesian, Italian
2 levels + innovative items + extras
You can create your own levels using the built-in level editor
You can make your own custom items, enemies and bosses using our object scripting system
MODdable capabilities
Good performance even on old computers