The collection adds a dozen classic 8-bit games from the Sega Game Gear, including Sonic Chaos and Sonic Triple Trouble .

For the first time in this format, Amy is fully playable across all four main titles ( Sonic 1, 2, 3 & Knuckles, and Sonic CD ), featuring her signature hammer attack.

The primary draw of the updated version is the inclusion of the , which can be purchased as standalone DLC or found in the "Plus" edition of the game.

The update adds Knuckles as a playable character in Sonic CD , complete with his climbing and gliding abilities.