Sonic Generations

Sonic Generations is an upcoming 2011 film in the Sonic the Hedgehog series, currently in production by Sonic Team. It celebrates the 20th Anniversary of the original Sonic the Hedgehog game and will be released by Sega on November 25, 2011.

Plot
An unknown enemy causes the appearance of multiple "time holes", forcing Sonic and his friends back in time. As a result, Sonic must band together with his past self to defeat this enemy and fix the timestream.

Gameplay
The game features levels derived from 20 years of Sonic history, spreading across three eras: Classic, Dreamcast and Modern. Each level can be played with either Classic Sonic or Modern Sonic, each taking their own routes throughout the level. Classic Sonic's levels are strictly two dimensional side scrolling stages, using classic moves like the Spin Attack and Spin Dash. On the other hand, Modern Sonic's levels follow 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, and the quick step, and the 3DS version using the 2D gameplay of the recent Nintendo DS games, such as the Sonic Rush series and Sonic Colors.

Development
The game was first revealed on April 7, 2011, when Sega posted a teaser trailer on their Facebook page. The teaser depicted both modern and classic interpretations of Sonic the Hedgehog running alongside each other. The game was officially unveiled as Sonic Generations on April 18, 2011, along with the first gameplay trailer. The game's plot is being penned by Ken Pontac and Warren Graff, who previously worked on Sonic Colors. Sega's Community Manager Aaron Webber revealed that Classic Sonic will be speechless. Both Classic and Modern Sonic will have their own sets of physics, the former of which Webber claims will be "closer to the classics than anything since, including Sonic the Hedgehog 4: Episode 1." Producer Takashi Iizuka has confirmed that although other characters will be making cameos and are also part of the story, only the two Sonics shall be playable. Iizuka also confirmed that each returning level shall feel familiar but will also feature a new visual element like the caves seen in the Green Hill stages.

A financial earnings report posted by Sega Sammy Holdings listed versions of the game for Nintendo 3DS and PC, though a revised version of the report no longer listed either version. The game was eventually confirmed in Nintendo Power to be coming to the Nintendo 3DS. The console and 3DS versions will differ from each other and will feature exclusive stages. It is also confirmed that Sonic Generations is not coming to the Wii due to its lack of HD graphics. In Japan, the PS3 and Xbox 360 versions of the game will be known as Sonic Generations: White Time and Space (ソニックジェネレーションズ 白の時空) while the 3DS version will be known as Sonic Generations: Blue Adventure (ソニックジェネレーションズ 青の冒険).