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 ...

This maze of jagged curls looks like something out of the world’s hardest puzzle book. How fast do you think you can solve it? Stuck? Don’t worry. It’s actually more of a connect the dots puzzle. The ...