Sonic Advance 3 is a 2004 platform and adventure game developed by Dimps for the Game Boy Advance, later available on Wii U. The game centers on Sonic and Tails working to reunite with Cream, Knuckles, and Amy in order to stop Dr. Eggman. A core mechanic involves pairing any two of the five playable characters, with each combination granting distinct abilities: Sonic boosts movement speed, Tails enhances jump height, Knuckles strengthens attack power, Amy contributes her Piko Piko hammer, and Cream enables a homing attack. This pairing system encourages experimentation across the roster to suit different playstyles or challenges. The game also supports a multiplayer mode for up to four players via Game Boy Advance link cable, allowing competitive play alongside the main single-player campaign.
Prior to the game's events, Doctor Eggman builds a robotic assistant named Gemerl, using parts from the robot Emerl who was destroyed in Sonic Battle. Eggman attempts an experiment using the Chaos Emeralds to perform the Chaos Control technique, but it goes awry and tears the world apart. This action separates Sonic and Tails from Amy, Knuckles, and Cream, all of whom Eggman finds and captures, intending to create a segment of his impending empire on each chunk of the planet. Sonic and Tails travel through the game's seven levels to recapture their friends and retrieve the Emeralds. The final boss fight takes place at the Altar Emerald temple. If the player defeats Eggman there without having all seven Chaos Emeralds, Eggman and Gemerl escape and fall off the edge of the temple. Peace is restored to the world, and Omochao snaps a picture of the five heroes. However, the game alerts the player that the Emeralds must still be collected for the true ending. If the player defeats Eggman at the temple with all the Chaos Emeralds, Gemerl stops running away with Eggman and attacks Sonic, causing the Emeralds to scatter. Gemerl uses them to take on a giant, orb-shaped form, but Sonic also uses their power to attain his Super Sonic form. With Eggman's help, Super Sonic destroys Gemerl. Tails later finds Gemerl's broken body on a beach, repairing and reprogramming it. The game ends as Cream plays with the now non-aggressive Gemerl at her mother Vanilla's house.
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