From Sonic Retro
|S2Beta:Nick Arcade Episode!
|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.
|S2Beta:Mean Machines Sega VHS!
|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.
|S2Beta:Sonic 2 Spanish Promotional VHS!
|A Spanish video showing final Sonic 2 sprites in prototype levels such as Hidden Palace.
The videos provide a lot of information, and allow us to put together a timeline showing which prototypes are older and which are newer.