Join all the dots without lifting pen from paper

If I asked you to join up nine points in a 3x3 array, using only four consecutive straight lines, without lifting pen from paper and visiting each point once only, you would find this solution very quickly.

This week's problem is more difficult however: to join up twenty five points in a 5x5 array, with similar constraints, using only eight consecutive, straight lines and visiting each point once only. Start at A and finish at B.

Find the solution online >>