SonicGDK Windows, Mac game - IndieDB

SonicGDK (short for 3D Sonic Games Development Kit) is a codebase, a collection of source codes, which allows anyone to create 3D platformer video games based on the Sonic the Hedgehog franchise. It can be freely modified and is integrated with the UDK, providing you with a modern game engine in which to develop your game.

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