Our Packing Box Puzzle contains twenty-five wooden pieces, all shaped like the number 1. Having all the pieces the same shape makes the puzzle a little less complex, but the shear number of blocks does pose a bit of a challenge. All you really have to do is pack all the pieces into the wooden box they come in, in such a way that the lid will fit snugly on top. Recommended for ages 12 and up.
(From the Brain Teasers shelf.)