The following are known Game Genie Codes for Quest for the Shaven Yak starring Ren & Stimpy on SEGA Game Gear.

• Start With 1 Life
  013 4EE E66
• Start With 5 Lives
  053 4EE E66
• Start With 9 Lives
  093 4EE E66
• Start On A Strange Level
  001 D8F 5D4
• Infinite Lives
  001 B8E 3BE
• Infinite Energy
  00E ACB 3BE
• Stimpy Starts With Less Energy After 1st Life
  021 C0E F72
• Stimpy Starts With Half Energy After 1st Life
  031 C0E F72
• Invincible After First Hit
  00E E7C E6E
• You Still Get Hurt When You Flash
  01E ECB 803
• Flash Twice As Long After Getting Hit
  99E ECB 803
• Flash Longer After Getting Hit
  FFE ECB 803
• Flash A Lot Longer After Getting Hit
  00E ECB 803