This little gem is definitely a challenge. This is probably similar in difficulty to GalacTIC (previously offered) in terms of moves and rotations. At one point you are making 26 moves to add the next piece! Extra joinery was needed for this one too. Lap joints and brass pins keep everything in order. There are a few different versions but they all use the same woods, no choices are available. Each piece is made from a single species, they are just used differently throughout the batch. A variety of exotic woods are the woods in these.