A logic grid puzzle presents a set of categories (e.g., names, colors, pets) with several items each. You are given clues that link items across categories. The goal is to deduce the complete mapping of all items using a grid to mark true (√) or false (×) relationships.

Switch to Solver mode. Click any cell in a grid to toggle between unknown → true (√) → false (×) → unknown. Use the Auto Solve button to apply basic deduction rules automatically. The tool propagates constraints and highlights possible next moves.

Yes! Switch to Maker mode. Add categories and their items. Then add clues using the “Add Clue” button. Clues can be applied to the grid automatically. You can export your puzzle as a JSON file to share or solve later.

The engine repeatedly applies: (1) If a cell is marked true, all other cells in the same row and column become false. (2) If a row/column has only one possible true cell (all others false), it is marked true. (3) Cross‑grid synchronization: a true in one grid implies false for incompatible pairs across other grids.

Your work is temporarily stored in your browser. For permanent storage, use Export to save a JSON file. You can later Import it to resume. No data is sent to any server.

It combines a full‑featured solver with a maker in one responsive page. You can build puzzles visually, add clues in plain language, and instantly see the grid update. Undo/redo, export/import, and a clean mobile interface make it ideal for puzzle lovers and designers alike.