Place the numbers 1 to 64 in the grid, so that each number is a knight's move away from its neighbour. The numbers 1 and 64 are also a knight's move away from each other. So, for example, the numbers 7 and 9 would each be a knight's move away from number 8.The letters c and s to the right and below the grid indicate where the cubes and squares are situated.

The following clues will help you place the numbers.

C. Only one number in the twenties.

D. Nothing divisible by 21.

F. Only two numbers in the thirties. Total 210.

G. Three numbers in the thirties.2. Nothing less than 20.

3. No number in the thirties.

4. Total 214.

6. Nothing divisible by 6 or 11. Only one number in the thirties.

7. Only one number divisible by 10.

8. Only one number divisible by 10.

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