No, not that Hamilton. I meant William Rowan Hamilton, the nineteenth century Irish mathematician. And not that sort of grid. I meant a square grid, like a chessboard or a Sudoku. Today’s two puzzles ...

Maths can be found in all sorts of surprising places. It can be found in childhood toys, like the Rubik’s cube. It can be found in the smallest snowflake. It can even be found in the completely made ...

Earlier today I set you two puzzles based on Hamiltonian paths in a square grid. A Hamiltonian path is one which visits every cell exactly once. (If you want a print out of the puzzles, click here.) 1 ...