The Somersault Kick (サマーソルト,Samāsoruto?, lit. "Somersault") is a technique used by Sonic the Hedgehog in the Nintendo 3DS version of Sonic Lost World as one of the reinvented moves Sonic can use thanks to the Parkour system. With this move, Sonic can jump while at high speeds to perform a Somersault. Basically, the Somersault is one of Sonic's three attack methods in the game, the other being the Homing Attack and the Spin Dash.
While Sonic must run at a fast pace and jump quickly to perform the Flying Kick in the Wii U version, the kick effect on the Nintendo 3DS version has been added to the Somersault; while turning around in the air, Sonic kicks out with his leg, releasing a thin blue wave in its wake that he can hit Badniks or other enemies with from afar. When there are enemies that cannot be defeated by a regular Homing Attack, Sonic can use the Somersault to attack said enemy. When hit by the Somersault's wave, the enemy is startled, giving Sonic the chance to attack the enemy with either a Homing Attack or Spin Dash. The Somersault only serves as a distraction attack, however, as it can only stun enemies and cannot destroy them. Some stronger enemies (ex. bosses, Sandworm) are not affected, and Zavok can deflect the kick to Sonic, who will be stunned.
In the Wii U version of Sonic Lost World, this move is replaced with the Flying Kick attack.