How logic grids work
Use the clues to match people, places, and things. Mark each match or elimination in the grid as you work.
One solution per puzzle
We run every puzzle through a solver before it goes to print. Each grid has a unique solution, and each clue contributes to it. Unfair puzzles may require guessing and backtracking.
How the difficulty changes
Start with the Introduction to learn the techniques. Harder books bring in larger grids, more categories, and more kinds of clues.
Help while you solve
Each paperback has an answer key in the back. To work through a puzzle with hints, open its grid and enter the marks you already have.