Are There Cheat Codes for Metroid Fusion?

No traditional cheat codes exist for Metroid Fusion.

The game includes secrets unlocked through gameplay:

• Hidden Missile Expansions: Found via thorough exploration.
• Secret Menu Room: Accessed by a specific D-pad code on the title screen (reveals minor extras, not cheats).

For easier play, save-file editors exist (external tools), but these are not cheat codes. Metroid Fusion is designed around exploration and skill.