Explore 4 classic remastered Sonic titles – Sonic the Hedgehog, Sonic 2, Sonic 3 & Knuckles, and Sonic CD in high-definition, with all-new opening and ending animations for each title! Spin Dash your way through numerous zones in Classic mode with the game’s original resolution and limited lives, or the new Anniversary Mode with unlimited lives in revamped widescreen HD. Includes previously released add-on content: Extreme Missions, Mirror Mode, additional screen borders, new character animations in menus, additional music from other Sonic titles, and more! Complete missions and unlock Mirror Mode, new stages, challenges, behind-the-scenes content, music player, animated shorts, special stages, and more! Play as Sonic, Tails, or Knuckles in Sonic the Hedgehog, Sonic the Hedgehog 2, Sonic 3 & Knuckles, and Sonic CD! AND for the first time ever, play as Amy Rose in these legendary classic titles!