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.

Ported to GCW Zero by d_smagin.

http://boards.dingoonity.org/gcw-releases/opensonic-0-1-4/