 Lost World focuses on the efforts of Sonic the Hedgehog to stop the Deadly Six , an alien tribe that serves as the game 's main antagonists , as they seek to siphon energy from the Lost Hex , the game 's setting . Sonic and his long @-@ time sidekick Tails must team up with Doctor Eggman , normally their enemy , to stop the Deadly Six , leading to conflicts among the three parties . While the gameplay is typical of the Sonic series in some ways , it adds parkour mechanics and features largely cylindrical level design with an emphasis on alternate pathways . The game also features the Wisp creatures from Sonic Colors and Sonic Generations as power @-@ ups . 
