Sonic Rush, after Eggman allied with his descendant Eggman Nega and stole the Sol Emeralds from of another world, Blaze, princess of said world, arrives in Sonic's world to retrieve them and she will also discover the meaning of friendship thanks to Sonic.

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Sonic Advance 2, Eggman returns to cause trouble, this time kidnapping the newcomer Cream and Tails, as well as tricking Knuckles into going against Sonic again; after Sonic rescues Cream, the latter starts her own adventure to save her mother from Eggman.

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Sonic Adventure 2, sequel to Sonic Adventure the plot consists of the interweaving of two parallel stories: the Hero Story and the Dark Story, where it all centers to a revenge on what happens 50 years before the events of the game in the Space Colony ARK.

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Sonic Blast, Dr Eggman attempts to kill Sonic with a laser beam but misses his aim and hits a Chaos Emerald, the latter breaks and splits into 5 Chaos Emeralds; meanwhile Knuckles witnesses the whole thing and decides to help Sonic in defeating the doctor.

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Sonic the Fighters, the first fighting game in the series, here Eggman builds the Death Egg II for his new plan to dominate the world, while Tails builds the Lunar Fox but needs the power of the Chaos Emeralds to be able to reach the doctor.

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Knuckles' Chaotix,set sometime after the events of 3&K, for the first time in the series the Echidna Clan is mentioned and this will lead to Eggman and Knuckles investigating an island, also Mighty makes his return and Team Chaotix appears for the first time

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Sonic 3 & Knuckles, this is Sonic 3 locked onto Sonic & Knuckles via Lock-on, as a result it grants a full experience of both games; for the first time in the series there are 2 stories in the game, Sonic's and Knuckles' where the latter occurs after Sonic's

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Sonic the Hedgehog Spinball, Eggman takes over Mt. Mobius where he turns it into a mechanical base and uses it to convert animals into badniks; after several retcons the game was finally turned canon.

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Sonic the Hedgehog CD, introduces for the first time the concept of timetravel and the beloved characters such as Amy Rose and Metal Sonic; after years of decades-long struggle it has finally been established that CD is placed chronologically between S1 & S2

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SEGASonic the Hedgehog, in this game Eggman kidnaps Sonic, Mighty and Ray (where they first meet) and transports them to his trap-filled island; it has only recently been established that this game takes place sometime after the events of Sonic 3 & Knuckles.

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Sonic the Hedgehog 2 (16-bit), the first game within the popular Death Egg Saga where it marks the first meeting between Sonic and Tails and the debut of Super Sonic; from here on there will be 7 Chaos Emeralds in the mainline games.

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Sonic the Hedgehog 2 (8-bit), released earlier than the 16-bit version, this version also has a different storyline where Tails is kidnapped by Eggman and Sonic will have to revisit South Island to rescue him, also this game is famous for its bad ending.

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Sonic the Hedgehog (16-bit), it narrates Sonic's adventure against his archenemy Eggman in an attempt to save the animals and South Island itself; recently this game has been retconned as the beginning of everything and first meeting between Sonic and Eggman

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