Special Stage (Sonic Chaos), Sonic Wiki Zone

Special Stages in Sonic Chaos are a series of five extra levels. The player can enter one of these Special Stages, each with their own unique features to utilize, to obtain one of five Chaos Emeralds (the sixth is earned through normal gameplay). To enter the Special Stage, the player must be playing as Sonic the Hedgehog and collect one hundred Rings from any of the two Acts in a Zone. The screen will then flash and the player is taken to the Special Stage. Once Sonic has all the Chaos Emeralds

Sonic Chaos Maps - Sega Master System and Game Gear - Sonic Galaxy.net

Sonic the Hedgehog CD (Video Game) - TV Tropes

Special Stage (Sonic Advance 3), Sonic Wiki Zone

Special Stage (Sonic Superstars), Sonic Wiki Zone

Special Stage (Sonic the Hedgehog) (8-bit), Sonic Wiki Zone

Sonic the Hedgehog (1991 video game) - Wikipedia

Special Stage (Sonic Chaos), Sonic Wiki Zone

Sonic Advance 2 - Wikipedia

Chaos Island Chaos Emeralds - Sonic Frontiers Guide - IGN

Sonic Rush - Wikipedia

Chaos Emeralds - Sonic Mania Guide - IGN

Special Zone (Sonic the Hedgehog Chaos) - Sonic Wiki - Neoseeker

Sonic the Hedgehog: Triple Trouble 16-Bit (Video Game) - TV Tropes

Special Stage (Sonic the Hedgehog) (16-bit), Sonic Wiki Zone

Special Stage (Sonic Rush), Sonic Wiki Zone