The Diabolical Tower

You will find yourself on any floor of a tower which counts 60 (and a ground floor). You will know which floor you are on are and you will see yourself evolving on the plan of this floor. Your goal is to find a fabulous treasure which is located somewhere leaves in the tower... But to take the treasure, you will need to display a 4-digit secret code. If you manage to take the treasure, you will have to keep it and exit the tower.