If you enjoy solving Rubik’s cube, then you could attempt to solve the Grime cube. The Grime cube was invented last year by Dr James Grime, a mathematician and public speaker promoting mathematics and residing in the University of Cambridge. His cube can be solved in two ways. The first way is to align the cube so that its faces are the same colour, akin to the usual Rubik’s cube. The second way of solving the cube is to arrange each face so that it contains a correct perimeter magic square. A perimeter magic square is a three-by-three grid filled with different numbers such that the sum of the numbers in the top row, bottom row, left column and right columns is equal to the number in the centre. The challenge is to go back and forth from one solved state to the other.

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