Shikaku Solver — Solve Any Puzzle Instantly

Stuck on a Shikaku (rectangle partition) puzzle? Enter your grid below and get the solution in seconds. Supports puzzles from 5×5 up to 10×10.

💡 Before You Solve — Try These Hints

1. Start with "1" cells — they're already complete 1×1 rectangles
2. Count possible shapes — a "3" can only be 1×3 or 3×1
3. Work from corners — fewer possible orientations
4. Use area arithmetic — all areas must sum to total grid cells

🧩 Online Shikaku Solver

Step 1: Select your grid size, then click cells to place numbers.

Size: 5×5 6×6 7×7 8×8 9×9 10×10 Reset

Click a cell to place a number. Click again to cycle 1→2→3→...→9→clear.

🧩 Solve Puzzle

📐 Shikaku Grid Sizes

Choose the right difficulty for your skill level:

📚 More Resources

• Shikaku Rules — complete rule guide with examples
• Strategy Guide — beginner to advanced techniques
• Daily Puzzle — new Shikaku challenge every day
• Rectangle Partition Guide — history, variants, and more
• MeowBlock vs Shikaku — how we compare to the classic

Frequently Asked Questions

How does the Shikaku solver work?

Enter the numbers from your puzzle into the grid editor, then click Solve. The solver uses backtracking to find all valid rectangle placements that satisfy the rules: each rectangle contains exactly one number, area matches the number, and every cell is covered.

What grid sizes does the solver support?

The MeowBlock solver supports Shikaku puzzles from 5×5 up to 10×10. Select your grid size from the dropdown, place numbers by clicking cells, then hit Solve.

Can the solver find all solutions?

Yes — the solver checks for unique solutions. Most well-designed Shikaku puzzles have exactly one valid solution. If multiple solutions exist, the solver will indicate the puzzle is not unique.

Is using a solver cheating?

That's up to you! The solver is a learning tool. Try solving manually first, then use the solver to check your work or understand where you got stuck. Over time, you'll need it less.