This page has a list of articles for Sonic the Hedgehog and covers short magazine articles not deserving of their own page.
A preview with early prototype screenshots.
Title: Sonic the Hedgehog
Sega/Release Date Unknown/Price Unknown/ACT
Subtitle: “Could it be another Alex Kidd?”
“They are trying to create a new original character with this “Sonic the Hedgehog”. Please stay tuned for further details.”
Main text: “For release next Spring comes an original character action game from Sega.
“We don’t have details on what sort of game this will turn out to be but judging from screens it looks quite different from anything we’ve seen to date from Sega. We think the colorful and bright graphics could turn out to be popular.
“It remains to be seen whether this will turn into another Alex Kidd Osaaru for Sega!”
Left picture caption: “The title screen. Will this become another popular original character for Sega?”
Right picture caption: “Will it be cute character graphics with whimsical action?”
A review for the game Sonic the Hedgehog, where each reviewer gives the game a nine out of ten.
These two clips from Electronic Gaming monthly give away cheat codes.
This magazine gives a small overview of the game.
This clip from "Games TM" features a retrospective of Eggman and dwells on what makes him a memorable villian.
This clip from gameplayers is from the 1991 issue of Gameplayers Sega Genesis Strategy Guide. It explains how there were two different Genesis pack-in games, Altered Beast and Sonic the Hedgehog. The Altered Beast package comes with a coupon for a free Sonic 1 game. The bottom letter contains a silly mock-up.
This clip from the same issue as the previous clip explains how to enable the debug mode. Note the "GP" written with Springs.
This includes a few Game Genie codes which affect jumping ability.
Mean Machines had this small preview about the Sonic the Hedgehog LCD game in one of its issues.
The original Sonic the Hedgehog is featured as one of the top 100 games for the Mega Drive. There is also a small blurb about Sonic 2. It also mentions Sonic CD and Sonic 3.
Info on this Sega CD release can be found here.
This clip from United Kingdom's "Sega Magazine" (which later became Sega Saturn magazine) discusses things which were deleted from the final version of Sonic the Hedgehog, including his air punch end of level animation, the Marble Zone UFOs, and the rolling ball from Green Hill Zone.
This is an article detailing a contest to draw a Sonic Comic book for Sega Visions.
This clip details Sega's business strategy around 1991. It also makes mention of Sonic's scrapped love interest in the original Sonic the Hedgehog, called Madonna. Images of her can be found in the Game Development section.