The following are known Game Genie Codes for Sonic the Hedgehog Chaos on SEGA Game Gear.

• Infinite Time
  008 3BD E6E
• Each Ring Worth 2
  022 1EC E6E
• Each Ring Worth 4
  042 1EC E6E
• Each Ring Worth 6
  062 1EC E6E
• Each Ring Worth 8
  082 1EC E6E
• Each Ring Worth 10
  0A2 1EC E6E
• Never Lose Rings
  3A9 DCB 2A2
• Start With Some Rings Most Of The Time
  22A 91D 2A2
• Sonic Starts With 1 Life
  016 93C E66
• Sonic Starts With 9 Lives
  096 93C E66
• Sonic Starts With 50 Lives
  506 93C E66
• Sonic Starts With 99 Lives
  996 93C E66
• Sonic Continues With 1 Life
  014 23E E66
• Sonic Continues With 9 Lives
  094 23E E66
• Sonic Continues With 50 Lives
  504 23E E66
• Sonic Continues With 99 Lives
  994 23E E66
• Tails Starts With 1 Life
  016 99C F7E
• Tails Starts With 9 Lives
  096 99C F7E
• Tails Starts With 50 Lives
  506 99C F7E
• Tails Starts With 99 Lives
  996 99C F7E
• Tails Continues With 1 Life
  014 28E F7E
• Tails Continues With 9 Lives
  094 28E F7E
• Tails Continues With 50 Lives
  504 28E F7E
• Tails Continues With 99 Lives
  994 28E F7E
• Infinite Lives
  3A6 24E 2A2
• Character Modifier
  00D2-CA0?

Modifiers

• 1: Sonic
• 2: Tails
• Cheat Enable Modifier
  00D2-D00?

Modifiers

• 1: Zone Select
• 2: Sound Test
• Infinite Lives
  00D2-9B99