Sonic Unleashed

Sonic Unleashed (Sonic World Adventure) is a video game in the Sonic the Hedgehog series. It has 2D and 3D gameplay in the Sonic stages. You can also play as the Werehog.

Story
Dr. Eggman is the primary antagonist for Sonic Unleashed. At the beginning of Unleashed, Dr. Eggman manages to trap Super Sonic. Sonic transformed using the power of the Chaos Emeralds - using a powerful new ray weapon, and uses the Emeralds' energy to unleash a powerful beast from the center of the planet. This has devastating consequences for the planet, which subsequently shatters into pieces; it is up to Sonic to return the seven broken continents back to normal by retrieving the Chaos Emeralds and activating their power. In addition, Eggman's ray also causes an unexpected transformation to Sonic's state, changing the way the story unfolds.

Characters

 * Sonic the Hedgehog (playable)
 * Super Sonic (playable)
 * Sonic the Werehog (playable)
 * Doctor Eggman
 * Miles "Tails" Prower
 * Chip
 * Amy Rose

Gameplay
Sonic can go form 2D to 3D in the stages. Sonic also has new abilities like the Drift allows Sonic to slide around a corner at high speed. Players will also be able to perform a new side-step maneuver known as Quick Step. Sonic will use experience to buy upgrades that gives new ablities. Sonic now has the  Boost ability for the first time in a 3D game. Also the game has a day and night system for levels, with high-speed platforming levels with Sonic the Hedgehog during the day and platforming beat-em-up levels with Sonic the Werehog during the night. The game will also feature Hub Worlds, however, only Gaia Gate hub worlds are accessible to all platforms. Their are different missions you can do in the hub worlds. 

Development
The development of Sonic Unleashed was announced in April 2008. Unleashed was originally intended to be the third installment of the Sonic Adventure series and subsequently, at an early development stage, had the working title Sonic World Adventure, complete with work-in-progress logo. However, the development team began to introduce enough new innovations to separate it from the Sonic Adventure titles, and so a new title, Sonic Unleashed, was decided upon.

The game is currently being developed internally by Sonic Team. With Sonic Unleashed being developed internally by Sonic Team. It will be a multiplatform release on the Wii, PlayStation 3, Xbox 360, and the PlayStation 2. There are two development "silos" that work on two separate builds of the game: one for the Xbox 360 and PlayStation 3 version, and one for the Wii and PlayStation 2 version. The Xbox 360 and PlayStation 3 versions will run on Sega's "Hedgehog Engine", which has been in production for three years and will produce a frame rate of 30 frames per second. The Wii and PlayStation 2 versions will not take advantage of the Hedgehog Engine, instead using a modified version of an existing, internal Sega engine.

The Wii version of the game will be developed specifically to take advantage of its controller's capabilities, with notable differences in gameplay. The game will use the Wii Remote and/or Nunchuk option; whilst character movement and basic actions will be assigned to buttons, certain actions will benefit from physical movements. It will support the GameCube controller, and also the option of using the Classic Controller. The levels, whilst sharing the same styles, themes and motifs as the Xbox 360 and PlayStation 3 versions, will be different to those shared between the Wii. First the gameplay will be changed, tuned, and balanced specifically for the Wii," says Patrick Riley, the game's producer at Sega of America. "Secondly, the levels will be different, designed specifically for the Wii version. and the PlayStation 2 versions, and Dimps will be involved with design of the daytime stages for these versions.

Gallery
The ps2 version is the original upgaded version on the wii