Open Sonic is a free 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. Open Sonic is available for Windows, Linux and Mac OS X.

Main features:
1. It's portable! No installation required!
2. Sonic-style physics (360 movement engine)
3. Available in 7 languages: English, Portuguese, Spanish, French, Polish, German, Czech
4. 2 levels + innovative items + extras
5. You can create your own levels using the level editor (example)
6. Good performance even on old computers

The license of this software is Free, you can free download and free use this arcade game software.