He attempts to kill Knuckles who is restrained by Eggrobo, only for Knuckles to break free and glide away at the last moment which causes Mecha Sonic's attack to kill Eggrobo instead. Mecha Sonic appears again as the final boss of Knuckles' story, where he is encountered once more in Sky Sanctuary. Sonic/Tails will then jump to the tower as the arena collapses, with Mecha Sonic falling off-screen. Mecha Sonic fights similarly to his earlier counterpart Silver Sonic from Sonic the Hedgehog 2 for the Sega Mega Drive, but with a more flexible range of attacks.Īfter hitting Mecha Sonic 8 times, the robot will short circuit and collapse, though he remains intact. Mecha Sonic dashes across the arena and destroys the Warp Pad as the player arrives, forcing him to defeat Mecha Sonic to complete the zone. Mecha Sonic himself is fought on a wide arena in front of a tall tower, accessed by using a Warp Pad. The first time he appears piloting the Egg Mobile-H, and the second time he fights using the Flying Eggman vehicle. When playing as Sonic or Tails, Mecha Sonic is encountered three times throughout the stage. Mecha Sonic first appears in Sonic & Knuckles as the boss of Sky Sanctuary Zone for all characters.