This game celebrates the 20th anniversary of Sonic the Hedgehog 2.The first to feature it was Sonic Advance 3 with Tails' mid air tag action. This is the first Sonic game to promote Tails carrying Sonic underwater.The color of Sandworm looks very similar to its iteration, Caterkiller.
With the recently released screenshots it is revealed that it is a move named Rolling Attack.
Play alone, or with a friend locally (and online), in an evolution of Sonic 2's collaborative gameplay! Unleash Sonic and Tails’ devastating joint attacks and combination moves to fight the united force of Metal Sonic and Dr. Joined by Tails, they utilize ingenious combination moves and race across four brand new Zones, in order to put an end to their evil plans. To face this new threat, Sonic will have to call upon an old friend to help him save the day. Metal Sonic has returned to form a formidable alliance with Dr. Eggman and Metal Sonic's plan once and for all? Eggman’s whole scheme will be revealed! Will Sonic and Tails stop Dr. Eggman searching for in the Lost Labyrinth? What was Mad Gear built for? They were all a mere puzzle piece of a grandiose project schemed by Dr. Meanwhile, Sonic has found out about the Doctor and his metal rival being back, so he recruits his buddy Tails to help him face this new threat and speed around the Little Planet once more and save it from disaster. Eggman finds the Metal 'hog and has made him even more powerful than before, to make Sonic no match for him. Elsewhere, Sonic's old robot rival Metal Sonic has survived his defeat back in CD, though was left on Little Planet when it disappeared before. Hearing that Little Planet has finally returned, Eggman eagerly hops back into action, the next phase of his scheme will begin to unfold. Eggman planned the entire plan from the very beginning of Episode I. Doctor Eggman, who was defeated in the previous installment, knew that was only the beginning of his big scheme that he had been planning in secrecy. A few months after the events of Episode I, Little Planet, where Sonic CD took place approaches once more.