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The inhabitants of South Island are in danger! Dr. Robotnik has stolen all the Chaos Emeralds which kept the power balance. Robotnik has thrown the Emeralds in a parallel universe and is keeping the red one. Sonic and Tails must retreive all the Chaos Emeralds before the destruction of South Island. This is the first Game Gear game where you can play either Sonic or Tails.


Sonic the Hedgehog Chaos SEGA Master System up the ramp
Sonic the Hedgehog Chaos SEGA Master System Bouncing around
Sonic the Hedgehog Chaos SEGA Master System Intro
Sonic the Hedgehog Chaos SEGA Master System Player Select

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Alternate Titles

  • "Sonic & Tails" -- Japanese title
  • "Sonic Chaos" -- Common title
  • "ソニック&テイルス" -- Japanese spelling

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Critic Reviews

Power Sonic Jan 10, 2014 9.25 out of 10 92 Dec 04, 2001 8.6 out of 10 86
Video Games Nov, 1993 78 out of 100 78
Megablast Dec, 1993 74 out of 100 74
Mean Machines Dec, 1993 71 out of 100 71
Mega Fun Nov, 1993 71 out of 100 71
SEGA-Mag (Objectif-SEGA) Mar 30, 2008 7 out of 10 70
ASM (Aktueller Software Markt) Jan, 1994 8 out of 12 67 Mar 11, 2011 13 out of 20 65
Retrogaming History Dec 04, 2009 6 out of 10 60


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In the US version of the game, the Gigalopolis Zone was changed to the Gigapolis Zone. This could be due to the fact that dimmer children might read the name as "Gigolopolis." It's odd that the same people who'd be so anal about such a comparatively innocent association could also be the same louts who allowed Phantasy Star III's villain to be translated as "Dark Phallus."
Junryeong (35) added Sonic the Hedgehog Chaos (SEGA Master System) on Sep 13, 2003
Other platforms contributed by Junryeong (35) and gamewarrior (5113)