After game compleetion with Super Sonic & all embulums are colected.
Would you believe Ultimate Chaos is not the real final boss in SA1? well it's true. Select Sonic in adventure field after all embulums are collected & u have beaten Chaos7 and you will go into a new story. After Sonic has stopped speaking goto the mystic ruins & take the cart to the forest go behind the temple & into Eggman's lare. our final boss will be Sonic, Tails & Knuckles VS Eggman, Hyper Sonic & Metal Sonic. This battle will have energy fields so when one of your charichtors get tired switch them. If you win you will be awarded with all seven chaos emeralds this means you can use Super Sonic in the adventure field aswell as all his normal missions.