The following are known Game Genie Codes for Contra Force on Nintendo Entertainment System (NES).

• Start All Characters With 1 Life
  PAUYTTLA
• Start All Characters With 6 Lives
  TAUYTTLA
• Start All Characters With 9 Lives
  PAUYTTLE
• Start All Characters With 98 Lives
  OPUYTTLE
• Infinite Lives (All Characters)
  AANVIAPA
• You Start The Game With Lots Of Lives
  UAUYTTLE
• Keep Weapons After Death
  OUEXNKOO