The following are known Game Genie Codes for NHL Hockey on SEGA Game Gear.

• Infinite Game Time
  009-D3B-E6E
• Timer Counts By 2
  029-D3B-E6E
• Each Period is 2 Minutes Long
  02E-40F-A2A
• Each Period is 1 Minute Long
  01E-40F-A2A
• Each Period is 99 Minutes Long
  99E-40F-A2A
• No Scoring
  00F-BE8-19A
• Always 1st Period
  00F-2E8-B39
  010-53A-F7A