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

• Start With 1 Life
  PAUENALA
• Start With 6 Lives
  TAUENALA
• Start With 9 Lives
  PAUENALE
• Start With 25 Bullets
  IZSEEAAI
• Start With 150 Bullets
  PASEKAAA
• Start With 250 Bullets
  ZASEKAAA
• Gain 1 Bullet On Pick-Up
  PASAUALA
• Gain 6 Bullets On Pick-Up
  TASAUALA
• Timer Set To 04:00
  LAKEGYTA
• Timer Set To 10:00
  PAKEGYTE
• Different Attack Waves
  SAKAVEKE
• Start With Lots Of Lives
  YAUENALE