Sonic Generations (ソニック ジェネレーションズ Sonikku Jenerēshonzu?) is a 2011 platform video game in the Sonic the Hedgehog series, produced by Sonic Team for PlayStation 3, Xbox 360, Microsoft Windows and Nintendo 3DS. It celebrates the 20th anniversary of the original Sonic the Hedgehog game and was released by Sega in North America on November 1, 2011, and will be released November 4, 2011 in Europe and for PC Download, and in Japan on December 1, 2011
In Japan, the two versions are given subtitles: the PS3/Xbox 360/PC version of the game is given Shiro no Jikū (白の時空?, lit. “White Spacetime”) while the 3DS version is given Ao no Bōken (青の冒険?, lit. “Blue Adventure”).
As Sonic celebrates his birthday with his friends, a mysterious new enemy called the Time Eater (タイムイーター Taimu Ītā?) appears, sucking everyone through various ‘time holes’ and scattering them across different places in Sonic’s history. As Sonic searches for his friends, he ends up meeting his old self, Classic Sonic. Both Modern and Classic Sonic decide to collaborate and race through their history in order to save their friends and fix the time stream.
The game features levels derived from 20 years of Sonic history, spreading across three eras: Classic, Dreamcast and Modern, which are played as either Classic Sonic or Modern Sonic. Classic Sonic’s levels are strictly two dimensional side scrolling stages, using classic moves like the Spin Attack and Spin Dash, while Modern Sonic’s levels follow a gameplay style similar to more recent entries in the series, with the console versions using the 2D/3D style gameplay of Sonic Unleashed and Sonic Colors, featuring homing attacks, boosting, speed drift, slide, stomp, and the quick step. The 3DS version will use the 2D gameplay of the Sonic Rush series. As well as classic power-ups such as Invincibility and Speed Shoes, certain levels have unique power-ups, such as skateboards in City Escape and Wisp powers in Planet Wisp. Each zone consists of a main act for each Sonic, as well as several side-missions with various challenges such as beating an opponent to the goal. A Skill Shop allows players to use points earned from high scores to unlock upgrades such as abilities, shields, and even the original Sonic the Hedgehog Genesis game. Similar to Sonic Colors, each main level contains various Red Star Rings which unlock various content, as well as Notes which unlock numerous music tracks which can be played during each stage. Unlike the console versions, the 3DS version will feature special stages (based on the ones from Sonic Heroes) and a multiplayer versus mode, and the majority of stages included will be different from those of the console versions. There are also several missions which can be unlocked via StreetPass, or by using Play Coins.