Sonic Adventure
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Parent game

An ancient evil lurking within the Master Emerald has been unleashed from its slumber by the devious Dr. Eggman and is on the verge of becoming the ultimate monster using the 7 Chaos Emeralds. Only Sonic and his friends are heroic enough to put a stop to Dr. Eggman and his evil minions.
DLCs

DLC for the PlayStation Network and Xbox Live Arcade versions of Sonic Adventure. It restores the ability to play as Metal Sonic and the Mission Mode from Sonic Adventure DX: Director's Cut.
Part of collection:
Sonic Adventure
(last 3 games)

Sonic Adventure 2, even though it has the same name, it is actually a remaster for the original Sonic Adventure 2, with updated graphics and the assets from Sonic Adventure 2: Battle.

Sonic Adventure 2: Battle is a DLC for Sonic Adventure 2 (2012). It adds the extra content of the GameCube game Sonic Adventure 2: Battle, such as new playable characters in the Battle mode.

Sonic Adventure DX: Director's Cut, although it has the same name as the GameCube and PC expanded version of the original Dreamcast game, is actually a bundle with both the game released first for Xbox 360 and PlayStation 3 under the title of "Sonic Adventure" and its DLC, "Sonic Adventure DX Upgrade". These two games are enhanced ports of the PC version of the original "Sonic Adventure DX: Director's Cut". This bundle/enhanced port adds full widescreen support for the game.
Part of collection:
Sonic the Hedgehog
(last 3 games)

In this all-new Sonic adventure, the evil Dr. Eggman has discovered The Reverie, an ancient device with the power to manifest dreams in the real world. Navigate twisted dreamscapes, rescue your friends, and put a stop to Dr. Eggman’s nightmarish dreams of world domination!

Adventure through the mystical Northstar Islands in this all-new take on classic 2D Sonic high-speed action platforming. Play as Sonic, Tails, Knuckles, and Amy Rose and harness all-new Emerald powers to move and attack in dynamic new ways. Navigate gorgeous, never-before-seen environments solo or with up to 3 other players and stop Dr. Eggman, Fang, and a mysterious new adversary from converting the islands' giant animals into Badniks before it's too late!

Worlds will collide in Sonic the Hedgehog’s newest adventure. An experience like never before, accelerate to new heights and experience the thrill of high velocity open-zone freedom. Battle powerful enemies as you speed through the Starfall Islands - landscapes brimming with dense forests, overflowing waterfalls, sizzling deserts and more!
Part of franchise:
Sonic The Hedgehog
(last 3 games)

Shadow the Hedgehog is back with Classic and Modern Sonic in Sonic X Shadow Generations, an all-new collection featuring two unique experiences! Play as Shadow in a brand-new story campaign featuring never-before-seen abilities that prove why he's known as the Ultimate Life Form! Speed through iconic stages from Shadow's history, discover hidden secrets in an expansive hub world, and unlock new powers to take on Black Doom and save the world. Sonic X Shadow Generations also includes a complete remaster of the highly acclaimed Sonic Generations, a time-traveling adventure featuring a greatest-hits collection of 3D and 2D Sonic stages, now with upgraded visuals and new bonus content.

Knuckles is ready to rumble! Muscle your way through all who dare stand in your path as the burly echidna.

Tails, the genius mechanic and Sonic’s closest friend, is ready to take flight on the course!
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