I got these as a for my puzzle loving oldest child (he is almost 20). He loves anything that is a challenge. These puzzles are neat and unique as they can be connected together and twisted into multiple configurations. Some design ideas included are: a hammer, a dog, a revolver, a spaceship, a cobra, etc.I even enjoyed twisting these things; even though I have not made any cool designs yet. They require skill and imagination; but offer a tactile challenge that can be tailored to kids (and adults) of all ages. I can see how my youngest nieces and nephews would derive hours of enjoyment from this puzzle. Well worth the cost and I love that it comes in a two pack!