The following are known Game Genie Codes for Kid Niki: Radical Ninja on Nintendo Entertainment System (NES).

• Infinite Lives
  GXSOKIVG
• Ninja Jumping Power
  NYUEXOEV
• Start With 1 Life
  PAOATZLA
• Start With 6 Lives
  TAOATZLA
• Freeze Timer
  AESUEGPA
• Reduce Timer Value
  GAUELZTA
  GEEPOTTA
• Start On Round 2
  PEVAYPAA
  PEUETPAA
• Start On Round 3
  ZEVAYPAA
  ZEUETPAA
• Start On Round 4
  LEVAYPAA
  LEUETPAA
• Start On Round 5
  GEVAYPAA
  GEUETPAA
• Start On Round 6
  IEVAYPAA
  IEUETPAA
• Debug Invincibility
  EEKEPPAA
  Note: Works on a new game only. This is certainly the Debug Invincibility. You’re partially immune to pits (jump left and land on a pit to die, if you’re stuck in one), and totally immune to everything else).