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

• Infinite Powers & Lives
  AESVLTPA
• Infinite Lives
  SXSIYASA
• Start Game With 1 Life
  AEVSUIZA
• Start Game With 6 Lives
  IEVSUIZA
• Start Game With 9 Lives
  AEVSUIZE
• Infinite Life Energy
  SZKGTTSA
• Phoenix Always Rescues You
  VTVTAESX
• Infinite Fire/Lightning/Power Beams On Pick-Up
  SLNNANSO
• Extra Dart Strength
  VTNXAOSE
• Start On Level 2
  PANZLPAA
  ATNXAOSA
• Start On Level 3
  ZANZLPAA
  ATNXAOSA
• Start On Level 4
  LANZLPAA
  ATNXAOSA
• Start On Level 5
  GANZLPAA
  ATNXAOSA
• Start On Level 6
  IANZLPAA
  ATNXAOSA
• Start With 44 Red Spheres
  XZNZGPSA
  VEEZYOSE
• Start With 44 Black Spheres
  XZNZGPSA
  VEEXZOSE
• Start With 44 Fire Spheres
  XZNZGPSA
  VANXLOSE
• Start With 44 Lightning Bolts
  XZNZGPSA
  VANXTOSE
• Start With 44 Power Beams
  XZNZGPSA
  VEEZPOSE