Try The Hamiltonian Circuit, a fun, relaxing puzzle game that’s easy to learn and hard to master.
Find a path to every square in the grid, avoiding walls and never crossing itself, to create a continuous circuit. There is only one solution to every puzzle.
To capture things, start with one of the simple 4×4 grids. Plan your move carefully. Try to think ahead; not just by one square, but by four or five. If you think you made a mistake, trace your line again. It will disappear.
If you really get stuck, tap Hints. If you make any mistakes, one will turn red, then disappear. But if you’re on the right track, we’ll add a line.
The puzzle starts with a 4×4 grid and goes all the way to 20×20. Larger puzzles are difficult and can take hours to solve. If you have to quit halfway, don’t worry: your progress will automatically be saved.
Many people find meditation to work on these circuits; others have access to ibuprofen. But no matter what camp you’re in, know that you’re honing your abstract thinking skills and challenging your brain in ways that really matter.
Inspired by a puzzle created by Irish mathematician William Rowan Hamilton in 1857, these circuits start out easy and get harder. Really difficult. Good luck!