The following is the manual for the Japanese release of Sonic the Hedgehog, including English translations when available.
(Translation by SamIAm. Translator’s Note: In this translation, the sentences have been left as grammatically intact as possible in order to more accurately convey the exact wording of the orignal text. This method, however, results in an unusual sentence structure and flow.)
The evil mad scientist Dr. Eggman is up to his old nasty tricks again. "Sonic…that annoying, impertinent hedgehog. Thanks to him, my great plans are always laid to waste! Oh, but this time, I'm going to rub him out with the power of science! Ha ha ha ha ha…"
South Island is a treasure trove of gems and ancient ruins. They say that it's the island where the mystical Chaos Emeralds lie. The Chaos Emeralds are a super-material that give energy to all living beings. Also, when applied to scientific purposes, they can be used for nuclear and laser based weaponry. However, nobody knows exactly how to get ahold of these emeralds. At the same time, though, they do say that the reason why South Island is always moving is because the emeralds are somewhere inside the island's hazy depths.
One day, crisis visited upon the island. And who showed up with it but Dr. Eggman and his cronies. "I'll find those emeralds even if I have to dig up the entire island to do it!"
Dr. Eggman set up a fort in one corner of the island, and went about carrying out his plan.
"Eggman, you still haven't had enough?" Sonic hurried as soon as he heard the news. Dr. Eggman never seemed to leave him alone, even though Sonic had beaten him every time so far. It sounded like Dr. Eggman considered Sonic his sworn enemy, but he was never any match for Sonic.
However, this time something is amiss.
"Have you seen it, Sonic? This time is going to be different! Because this time, I've turned all the animals on the island into robots!"
"All of them go about in accordance to my orders. In other words, Sonic, everyone on the island is your enemy! Gya— Ha ha ha ha ha ha ^cough^ ^ack^ ^ahem^. This time, the world really will be all mine!"
This is terrible! Hurry! Sonic the Hedgehog - everyone is waiting for your help!
(Translation by Mary Yamasaki.)
The malevolent gifted scientist, Dr. Eggman, prepares his bad intentions again:
" Sonic... This impertinent, this contrary hedgehog; he hopes that my bigger projects are always annihilated. But this time, my strength that resides in my intellect will crush him! Ha ha ha ha..."
South Island is a treasure of jewels and ruins, including the "Chaos Emeralds" that sleep buried somewhere within the island. These stones deal to all life a terrific energy. New techniques basing themselves on nuclear weapons and laser radii are then possible. But, they are not necessary should these stones fall between bad hands that don't understand their power. Also, since South Island is an island with a circular movement, the island started forming a interdimensional torsion in which the Chaos Emeralds wander.
One day, something horrible presented himself on the island. Dr. Robotnik and his army set foot there. "Ha ha!. Even though it is necessary to transport every particle of this island, I will have the Chaos Emeralds!! Then, Dr. Robotnik undertook the development of an enormous fortress in an angle of the island.
"Dr. Robotnik, not again, him?!!! Hearing rumors circulating on South Island, Sonic ran. Dr. Robotnik thinks that Sonic is his deadly enemy, but Sonic does not really account of his adversary. However when Sonic arrived on South Island, a strange spectacle was held before Sonic.
"Look Sonic, this time the situation is totally different! ALL the animals of the island have been transformed into robots!"
"These individuals act henceforth under my unique control. In short, all the island is now your enemy! Bwa ha ha ha ha ha.. This time, the whole world will be mine!"
Difficult! But go for it!
As Sonic the Hedgehog, everybody waits for your help.
Scans of the full manual, as seen in Sonic Jam, are below.