The second, Dark Gaia, is a side-scrolling adventure featuring a similar gameplay style to Sonic 3. The first stage, Alex Kidd in Miracle World, features a side-scrolling platformer with elements of the style of Sonic the Hedgehog and Sonic 3. A CD containing the soundtrack was released in November 2006 for Xbox 360 and PlayStation 3, and a soundtrack album was released later in 2007. The soundtrack consists of rock-style music arranged by Jun Senoue. This allows the game to include more detail in the level design.

The sense of weight was incorporated in Sonic the Hedgehog through the use of physics engine ILFORD Tone Mapping, which improves the graphic quality by blurring levels when projecting the image on a plane. This engine allowed Sonic the Hedgehog to feature detailed areas such as tunnels and volcanoes. Sonic the Hedgehog employs a game engine developed by Arc System Works known as SAGE (as opposed to the proprietary engine in games such as Sonic Adventure 2). Players will be able to switch between Sonic and Tails during gameplay. Tails can aid Sonic by providing access to various items throughout the game or avoiding enemies, such as bombs or fire. Sonic the Hedgehog also has a second playable character, Tails, who acts as a companion and guide through each level. Worlds outside of the shadow world are located in the ordinary world, where Sonic can interact with the people there. The shadow world is reflected in Alphaville by a number of similar areas with different hallways.

The chaos emerald will have a deadly effect if it remains in a living being and the world is constantly trying to absorb it. When Sonic leaves the shadow world, the world is influenced by the chaos emerald which is in Sonic the Hedgehog. Robotnik and inaccessible to normal people. The game places Sonic in the shadow world, a parallel dimension created by Dr. The main character Sonic the Hedgehog is voiced by Benji Gregory.

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