The rewards for each of the hedgehogs come in form of an overpowered ugrade hidden in one of their stages. There are now rewards for Sonic, Silver and Shadow for clearing all of their respective stages with an S rank. Silver has received two new upgrades that are hidden in his stages as well, with one of them giving him a move he used in his boss fight in Sonic Generations (2011). Sonic's, Silver's and Shadow's upgrades from the original game have been made available from the start, while Sonic's optional upgrades, the Gems, are now hidden around his stages for the player to obtain.

Other levels have been made longer, such as Blaze's Wave Ocean. Some levels have received slight changes to level design, such as some elements being brought back from the original game's demos, for example, a bridge now replacing a wind path at the beginning of Sonic's Kingdom Valley. Players can also choose between various cosmetic options, for example, make Sonic's animations resemble those from a 2005 prerelease showing, or change the appearance of the HUD. Character attributes have been altered: for example, every character now runs faster, while some moves for Tails, Knuckles, Shadow and Amy from Sonic Adventure (1998) and Sonic Adventure 2 (2001) have been reintroduced. The graphics are more detailed and the game uses different color grading. The physics are far more advanced than the original, as Project '06 runs on the Unity engine, while the original was on the Havok engine. The time spent on loading screens has been significantly reduced. Īlthough a faithful recreation, Project '06 features various changes designed to improve the experience. As of Demo 5, the game features all nine playable characters: Sonic the Hedgehog, Shadow the Hedgehog, Silver the Hedgehog, Miles 'Tails' Prower, Knuckles the Echidna, Rouge the Bat, E-123 Omega, Blaze the Cat, and Amy Rose. Project '06, a remake of the 2006 video game Sonic the Hedgehog, is a 3D platformer. Further information: Sonic the Hedgehog (2006 video game)

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