Test your brain with this challenging 12-piece wooden number puzzle.
One to test those good with numbers, this fun challenge is a sudoku-like brain teaser to get you thinking. Arrange the numbers so that each line horizontally, vertically and corner-to-corner diagonally adds up correctly to 264. From the Einstein collection, each number can be flipped upside down to make a new number, so needs careful thinking. See who the real genius in the family is with this challenging puzzle - are you as smart as Einstein?