Things You'll Need
Instructions
Take a look at the table in the First Class Lounge. Remove the tea cake from the plate.
Use the library card obtained from the bookshelf puzzle to scoop up some powdered sugar from the plate.
Walk to the coat closet and take a look at the keypad. Cover the keypad with the powdered sugar.
Return to the First Class Lounge and give the coat check chit you obtained from the floor of the elevator to Thomas.
Walk back to the coat closet and take another look at the keypad. Some of the keys don't have sugar on them. Press these keys to open the closet. The order in which you press them does not matter.