The following are known Game Genie Codes for Gain Ground on SEGA Genesis.

• D3GA-AAE2
  30 seconds to complete the round
• HVGA-AAE2
  1 minute to complete the round
• MKGA-AAE2
  1 minute and 30 seconds to complete the round
• SBGA-AAE2
  2 minutes to complete the round
• 0VGA-AAE2
  3 minutes to complete the round
• 8BGA-AAE2
  4 minutes to complete the round
• 97GA-AAE2
  4 minutes and 15 seconds to complete the round
• AVGA-AA8E
  Infinite time to complete the round
• AK9T-AA5E
  Must get everybody to the exit to complete the round
• SB9T-BLXE
  Each defeated enemy counts as 2
• SB9T-BRXE
  Each defeated enemy counts as 3
• SB9T-BWXE
  Each defeated enemy counts as 4
• SB9T-B0XE
  Each defeated enemy counts as 5
• SB9T-B4XE
  Each defeated enemy counts as 6
• SB9T-B8XE
  Each defeated enemy counts as 7
• SB9T-BCXE
  Each defeated enemy counts as 8
• SAYT-BJVE + SAYT-BJVJ
  Play every other Stage (Example” 1, 3, 5, 7, etc…)
• SAYT-BNVE + SAYT-BNVJ
  Play every 3rd Stage
• SAYT-BTVE + SAYT-BTVJ
  Play every 4th Stage
• SAYT-BYVE + SAYT-BYVJ
  Play every 5th Stage
• SAYT-B2VE + SAYT-B2VJ
  Play every 6th Stage
• SAYT-B6VE + SAYT-B6VJ
  Play every 7th Stage
• SAYT-BAVE + SAYT-BAVJ
  Play every 8th Stage