This challenging puzzle set includes four peg bases, each with three notched tiles. The four bases fit together with jigsaw cut-outs, and the colourful tiles must be turned correctly to fit down over the peg knobs. The four bases measure 19 cm (about 7.5") square when all joined together, and the pegs themselves are affixed to the bases with a small bungee-type cord to ensure that they cannot be broken off.