Sonic the Hedgehog 3 is a platform game developed by Sega for the Nintendo Wii. It continues the story of Sonic after his victory over Dr. Robotnik in Sonic the Hedgehog 2. Players navigate through diverse levels, meet Knuckles the Echidna, and seek the Chaos Emeralds while thwarting Dr. Robotnik's plans to restore his Death Egg.
The game is a sequel to the Sonic the Hedgehog 2 for the same system and follows on directly from the end of the game, in which Sonic defeated his enemy, Dr. Robotnik; crash-landing on a floating island, Sonic encounters new character Knuckles the Echidna, and must once more retrieve the Chaos Emeralds while also working to stop Dr. Robotnik from relaunching his ship, the Death Egg.