 A special , limited stock " Deadly Six " edition of the Wii U version of the game was available for pre @-@ order , which included special " Nightmare " downloadable content , featuring a new stage and boss battles based on one of Sonic Team 's previous games , Nights into Dreams .... Clearing the DLC unlocks a special Color Power , the Black Bomb , normally only obtainable via Miiverse . Pre @-@ ordering the game from Amazon.com allowed the player to start off with twenty @-@ five extra lives . 
