Zero Escape: The Nonary Games (UP)

In the safe in each escape room you will find a folder, provided you've found the secret code in each room (designated by a blue screen instead of a green one). If you are playing the game on Easy (and you shouldn't be) then this folder will be silver and will be missing a few files from each folder. On Hard, this folder will be gold and will contain every file (including those found in the silver folder). Collect every gold folder from every escape room and you will unlock this trophy.