The following are known Game Genie Codes for Castlevania: The Adventure on Nintendo Game Boy.

• 048-5EF-E62
  Start with 5 lives
• 068-5EF-E62
  Start with 7 lives
• 025-5CF-C42
  Start with 2 energy bars
• 045-5CF-C42
  Start with 4 energy bars
• 065-5CF-C42
  Start with 6 energy bars
• 029-B3F-A26
  *Start with the timer at 2:15 on the 1st Stage only
• 049-B3F-A26
  *Start with the timer at 4:15 on the 1st Stage only
• 079-B3F-A26
  *Start with the timer at 7:15 on the 1st Stage only
• 00A-F28-3B7
  Infinite energy
• 004-07F-3B7
  Infinite time (Switch off at the end of stages to go to the next one)
• 006-94F-3B7
  Infinite lives