The following are known GameShark / Action Replay Codes for Christmas NiGHTS Into Dreams… on SEGA Saturn.

• Master Code
  F6000914 C30A
  B6030040 0000
• Infinite Time
  160FFB12 5FFF
• Infinite Blue Orbs
  360FFD58 0063
• Infinite Present Guesses
  160CF4D2 0038
• Level Modifier
  160FFB14 0???

Level Modifiers

• 0: Stage 1
• 1: Boss 1
• 3: Boss 2