If the player collects all the Chaos Emeralds , Sonic proceeds into a black void , where he engages in a final battle with Robotnik , who pilots a large robot .
Sonic travels through the island , saving the Flickies and clashing with Robotnik in his various machines .
If the player collects all the Chaos Emeralds , Sonic proceeds into a black void , where Sonic engages in a final battle with Robotnik , who pilots a large robot .
Sonic travels through the island , saving the Flickies and clashing with Robotnik in his various machines .