Sign In

Sign In is a simple logic puzzle that will challenge the versatility of the solver, as they’ll need the clues that are not there just as much as the ones that are. In a 5×5 grid, the solver must place the numbers 1 to 5 so that each row and each column contains all of the numbers.

Plus and minus symbols between squares indicate all instances where a number is 1 more or 1 less than its neighbour to the left or above. It’s the logical negative of this rule that makes the puzzle so interesting.

We create Sign In puzzles at sizes from 5×5 to 9×9, at all levels of difficulty.