Before Sonic 2 went gold, many preview pictures of Sonic 2 appeared in magazines. Here we'll examine some of those pictures and see if there's any discrepancy with the final Sonic 2 or the prototype we have.

Each picture is examined and then declared as mock-up, earlier prototype, or newer prototype. Screenshots that appear to be from the same prototype as the one we have are not listed here because they're not particularly interesting.

Click on a thumbnail for a detail analysis.

#	Thumbnail	Description	Conclusion
M01		A Hidden Palace picture that showed up on various magazines.	Mock-up
M02		Another Hidden Palace picture, this time showing Sonic zipping through a green tube.	Newer Prototype
M03		The only picture featuring a desert level in Sonic 2.	Mock-up
M04		An off-centered Sonic in Emerald Hill.	Mock-up
M05		Mystic Cave Zone.	Newer Prototype
M06		Sonic and Tails spindashing up a slope in Casino Night Zone.	Newer Prototype
M07		Sonic and Tails in a later Hidden Palace	Newer Prototype
M08		Prototype title screen right in your Sonic 2 manual.	Newer Prototype
M09		Hill Top Zone featuring green balls on the seesaws.	Earlier Prototype
M10		Level select with some zones added and removed.	Newer Prototype
M11		Sonic lying down in Wood Zone.	Newer Prototype
M12		Neo Green H-something Zone.	Newer Prototype
M13		A newer Hidden Palace.	Newer Prototype
M14		Two-player split-screen in Emerald Hill. Tails has hybrid icon.	Newer Prototype
M15		Boss landing straight down as Tails flies. From the same prototype as above.	Newer Prototype
M16		Sonic displaying final ledge animation. From the same prototype as above.	Newer Prototype
M17		Sonic displaying final running animation. From the same prototype as above.	Newer Prototype
M18		Newer Aquatic Ruins Zone.	Newer Prototype
M19		Prototype Special Stage.	Newer Prototype
M20		Title screen for the GamePro prototype.	Newer Prototype
M21		2P mode of the GamePro prototype, showing Tails having Sonic's icon.	Newer Prototype
M22		Sonic in a spinning net.	Newer Prototype
M23		Exploding prototype EHZ boss.	Newer Prototype
M24		Final Sonic sprites in the GamePro prototype.	Newer Prototype
M25		Extra score counters and linked ring counters.	Newer Prototype

Putting all the little pieces together, we can construct a timeline showing which prototypes come first.

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