The following are known Action Replay Codes for Alex Kidd: High-Tech World on SEGA Master System.

• Infinite Time – Seconds Digits
  00C1-0E00
• Infinite Time – Hour Digit
  00C1-0F00
• Map Pieces
  00C0-820?
  Note: Replace ? with 1-8 for each respective map piece.
• Fake Map Piece
  00C0-8209
• Ladder
  00C0-8401
• Restorer
  00C0-8501
• Key
  00C0-8601
• Pencil
  00C0-8701
• Eraser
  00C0-8801
• Cloth
  00C0-8901
• Hang Glider
  00C0-8A01