The following are known Game Genie Codes for Syd of Valis on SEGA Genesis.

• Infinite Bombs
  AK2A-AA8W
• Infinite Energy
  HA3A-AYVR
• Infinite Lives
  AKHT-AA9T
• Start With 3 Times As Much Energy (1st Life Only)
  97DT-BB7R
• Protection From Spikes And Pits
  HBKT-AYXW
• Invincibility Against Enemies, Bullets, Etc.
  AA2T-AA58
• Invincibility Against Dangerous Zones (Lava, Acid, Etc).
  EBKT-AA5T