The following are known Game Genie Codes for Clash at Demonhead on Nintendo Entertainment System (NES).

• Don’t Die When Power Hits Zero
  VZSULOVV
• Start With 1 Of Each Item
  VNNGNUSO
• Infinite Supply Of All Items Bought
  SXKZGSVS
• All Items In Shop Are Free
  AVUGAGST
• Start With Extra Cash
  TAUGKGKY
  UPUGVKXO
• Start With 50% Power
  AAEKVGAO
  AEVZNPAO
  ZAOGXGGA
• Start With 150% Power
  APEKVGAO
  TAOGXGGA
  AOVZNPAO
• Start With 200% Power
  AZEKVGAP
  AAOGXGGE
  AXVZNPAP
• 3 Codes In 1 – Infinite Jet Pak Fuel, Infinite Agua Lung Air, And Infinite Powerboot Energy
  SLVKPUVS
• Infinite Ammo For Rolling Star, Powerball, And Thundershot
  SXNEXVVK
• Infinite Barrier Hits
  SXNZKSVK
  Note: If you use a Game Genie code to start with a Barrier, you will still lose your Barrier after your encounter with Tom Guycot at the beginning of the game, so it’s best to wait to use the barrier until after you meet Tom Guycot.