Shippers Dilemma Y Difficult Wood Puzzle for ages 18 and up detective spy kit The Cornell Lab of Ornithology

The Cornell Lab of Ornithology has developed QR codes which allow you to listen to the songs and calls of hundreds of birds

Ideal for hiding clues about what to do next during your Escape Room experience

Help teach sign language with our Montessori style sign language educational board

White (do not use for the base

Shippers Dilemma Y Difficult Wood Puzzle for ages 18 and up detective spy kit The Cornell Lab of OrnithologyLearn more about the Shipper's Dilemma Y Wood Puzzle Difficulty level 10 out of 10 Many of you know and love our Shippers Dilemma puzzle. This Shippers Dilemma Y puzzle (and shippers Dil Z) are related, and just as hard or harder to figure out. The object here is to make a perfect cube from the 25 "Y" shaped pieces that will fit under the very pretty cover. This puzzle was invented by David Klarner and published in the Journal of Recreational