This is a classic puzzle made from six identical pieces which go together in a star pattern. There are videos on YouTube showing how the puzzle goes together. The puzzle is usually made from wood, so when cut out and sanded, the pieces go together with a bit of wiggle-room. This one goes together smoothly, without gaps, so you have to assemble it carefully. You can't put it together using the "build it with five pieces and wriggle the last piece in" method, because there is no slack. You have to hold three assembled pieces in one hand and three in the other then slide them together with a twisting motion.