That's Retro Sonic, it's a full game but also an engine to create your own Sonic games. It's definitely one of the most interesting Dreamcast projects of the past two years:
http://www.dreamcast-scene.com/index...ain/RetroSonic
We've mirrored the release as a ready-to-burn CDI at DCEvolution.net:
http://dcevolution.netfirms.com/down...onic-Demo1.rar
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