Sonic the Hedgehog 20th Anniversary

Sonic the Hedgehog 20th Anniversary (ソニック・ザ・ヘッジホッグ Sonikku za Hejjihoggu 20th Anniversary) is a 2011 platform video game developed by Sonic Team and published by Sega for the PlayStation 3 and Xbox 360. The game primarily allows the player to use Sonic, Shadow and Silver across several stages. Other secondary characters also become playable across the game. The plot follows Sonic's quest to protect Princess Elise after she is kidnapped by his rival Dr. Eggman and is aided by returning allies.

The game has been referred to as Sonic 2011. It was produced in commemoration of the 20th anniversary of the Sonic the Hedgehog series. The game faced no issues during development, which resulted in releasing the product with no existing bugs. Critics praised both versions for short to no loading times, great camera system, no gameplay glitches, simple plot and good character control.

It was basically a remake of Sonic 2006 (official name Sonic the Hedgehog).