The following are known Game Genie Codes for Devilish on SEGA Game Gear.

• Infinite Balls
  00C EDA 19E
• Infinite Credits
  3A3 A6E 2A2
• Start With 2 Balls
  011 76D E62
• Start With 7 Balls
  061 76D E62
• Start With 9 Balls
  081 76D E62
• Start With 2 Credits
  012 9AE E62
• Start With 6 Credits
  052 9AE E62
• Start With 8 Credits
  072 9AE E62
• Start On Stage 2 – Under Passage
  022 E2E E6E
• Start On Stage 3 – Waterfalls
  032 E2E E6E
• Start On Stage 4 – Old Castle
  042 E2E E6E
• Start On Stage 5 – Prairie
  052 E2E E6E
• Start On Stage 6 – Volcano
  062 E2E E6E
• Start On Stage 7 – World of Ice
  072 E2E E6E
• Start On Stage 8 – Evil Temple
  082 E2E E6E