CheatCodes.com has all the official Mystery Case Files: Million Heir DS cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Tuesday June 18, 2013 for Mystery Case Files: Million Heir are shown below.
When your flashlight goes out, you will need to leave the room you are currently in and go to another location in the game. There is an arrow in the lower left corner of your screen that will take you back to a list of locations. Go from one location to another until "Battery" shows up on the list of items to find. Look for a battery. This will recharge your flashlight. Go back to your original location.
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