Try to find Arsène Lupin and try to stop him before he finds the blue diamond. Each player tries to find his 5 objects before accusing Arsène Lupin. The player who plays Arsène Lupin tries to find 4 objects, the blue diamond and escape before it happen. At the beginning, rôle between Arsène Lupin and clients is drawn and stays hidden until the end. 60 hidden objects are place in the hôtel. The mechanism is very simple, a player throws a dice on each turn and moves in the Hôtel. If his move ends on an object, he look if he belongs, and then take it back in his bedroom. When a player recovers 5 objects, he can accuse Arsène Lupin, if this player is Arsène Lupin, he leaves the hôtel.