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

• Infinite Lives
  SXKAVIVG
• Infinite Keys
  ATSXATEY
• 75 Lives Instead Of 50
  LKUZTZZU
• 25 Lives Instead Of 50
  POUZTZZU
• Don’t Lose Life From ‘Reset’ Or ‘Back’ Options
  SXKNKLVG
• Use Sword (Press ‘B’) As Long As You Like
  SZOEIUVK
• Now You Can Move While Using Sword
  XXOAZGYA
• Must Use With The Last Code For Permanent Sword-Wielding Ability
  IAEEALYP
• Supercharged Speed-Up
  GAXEGIZA
  GAUEGIZA
• Turbo Fuel-Injected 16-Valve Speed-Up
  AAXEGIZE
  AAUEGIZE