Tails flies Sonic to visit Angel Island. When they arrive at the island, Knuckels, the guardian of the island attacks Sonic and steals the Chaos Emeralds. As it turns out, Dr. Robotnik crash landed on the island after his Death Egg was destroyed. He has convinced Knuckels that Sonic is the bad guy and must be stopped. As Sonic and Tails fight to stop Robotnik latest evil plans, they must get past Knuckels as well.
Did You Know?
This is the first Sonic game that gives you ability to save your progress. See more
When the countdown begins to notify the player that Sonic is running out of air in Hydrocity Zone when fighting the mini-boss, if Sonic replenishes his air, the music will switch to the mini-boss music from "Sonic & Knuckles". This also happens during the fight with Robotnik in the same Zone. See more
If you collect all the Chaos Emeralds in this game, the ending will be the SONIC 3 logo with Sonic and Tails standing beside it. If you do not, the ending will show Robotnik and Knuckles juggling the emeralds you did not get under a TRY AGAIN sign. See more
Spin-off Knuckles' Chaotix