Enjoy twelve metal disentanglements puzzles for each of the twelve nights of Christmas with this beautifully bound brainteaser advent calendar. Open the book and discover a new challenge for each night. The Hollly Jolly 12 Days of Christmas advent makes a great gift for any one looking for something special for that smart person in their life, or anyone looking for a an advent that is not edible. For each metal disentanglement puzzle, you must figure out how to separate the two pieces and then be able to link them back together again.