We have collaborated at 11th edition of the "haunted night", at 13th anniversary of the Museu d'Història de la Joguina (Toy History Museum) of Sant Feliu de Guixols (Girona). We created a new game of keys for children, based on 4 type of keys and countermoulds. Because the star proof of the night was to find the specified key from the rest inside a big box, in order to collect a great gift.