This is the best book that has ever been published. The models go from intermediate to extremely difficult.The hardest models in the book are the deer, the two crabs, the knight on horseback (one sheet), the octopus (has eyes), the squid (has eyes), and the butterfly (has eyes). These are the models that get so small that you have to start out with a newspaper in order to even contemplate finishing them. I have made a few of these models like the knight on horseback and the two crabs, but I am still working on the butterfly because that one is simply amazing. This is a good book but it is definately not for beginners or people with patience that runs out after an hour or the tenth sheet.