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From Sonic Retro

The Sonic 2 Beta Wiki Origin | FAQ | Downloads | Cheats | Comparisons | Prototype Zones | Music | Concept Art Sketches | Magazine Previews | Video Previews | Timeline | Lost Sprites and Tiles | Savestates | False Alarms | Summary | Sonic 2 Algorithms & Specs Patents

TV Previews

#	Snapshot	Description	Conclusion
T01		An Nick Arcade episode featured a prototype version of Sonic 2. Weird things about it include Star Light music when playing Emerald Hill, missing Tails, a missing building in Chemical Plant, and weird zone layouts.	Earlier prototype
T02		Captured from a VHS cassette that came with an issue of Mean Machines Sega. Part of the video exposes the bugs in various levels in Sonic 2 prototype.	Newer prototype
T03		A Spanish video showing final Sonic 2 sprites in prototype levels such as Hidden Palace.	Newer prototype

The videos provide a lot of information, and allow us to put together a timeline showing which prototypes are older and which are newer.