From your first rectangle to grid mastery — proven strategies for every skill level.
🐱Start with "1" cells
A cell numbered 1 is already a complete 1×1 rectangle. No dragging needed — it's done. These freebies reduce the grid fast.
📐Count possible shapes first
Before dragging, think: how many ways can this number fit? A "3" can only be 1×3 or 3×1. A "4" can be 1×4, 2×2, or 4×1. Fewer options = easier to place.
📌Work from corners and edges
Corner cells have fewer possible rectangle shapes. A "2" in a corner can only go one direction. Place these first to constrain the rest of the grid.
🔢Use area arithmetic
All rectangle areas must sum to the total grid cells. A 5×5 grid = 25 cells. If you've placed rectangles totaling 20, the remaining numbers must sum to 5.
🚫Eliminate impossibilities
If a number can only fit in one orientation given surrounding cells, that placement is forced. Look for cells where other rectangles have already eaten the alternative space.
🔗Work inward from edges
Edge and corner placements constrain the interior. Each placed rectangle reduces the available shapes for neighbors. Build a "frame" first.
🧮Factor large numbers
A "6" can be 1×6, 2×3, 3×2, or 6×1. Check which dimensions fit the available space. If the remaining area is only 2 cells wide, a 3×2 is impossible — it must be 2×3.
🧠Chain reasoning
Placing one rectangle forces or eliminates options for neighbors. Follow the chain: "If I place this 2×3 here, then that 4 must be 2×2, which means..." — one decision cascades through the grid.
🔍Parity analysis
Some grid regions have forced patterns. If a 2×2 corner area has two numbers that sum to 4, they must tile that corner exactly — no room for alternatives.
↩️Hypothetical reasoning
Stuck? Try: "What if this 3 goes horizontal?" If that leads to a contradiction (overlap, gap, or impossible shape), then it must go vertical. This is the most powerful technique for hard puzzles.
| Area | Possible Shapes |
|---|---|
| 1 | 1×1 |
| 2 | 1×2, 2×1 |
| 3 | 1×3, 3×1 |
| 4 | 1×4, 2×2, 4×1 |
| 5 | 1×5, 5×1 |
| 6 | 1×6, 2×3, 3×2, 6×1 |
| 7 | 1×7, 7×1 |
| 8 | 1×8, 2×4, 4×2, 8×1 |
| 9 | 1×9, 3×3, 9×1 |
| 10 | 1×10, 2×5, 5×2, 10×1 |
| 12 | 1×12, 2×6, 3×4, 4×3, 6×2, 12×1 |
Start with prime numbers (2, 3, 5, 7) — they can only form 1×N or N×1 rectangles, so their shape is forced. Then work on numbers in corners or edges where placement options are limited.
Practice on smaller grids first (4×4, 5×5) to build pattern recognition. Learn to spot forced placements quickly, and always check if a rectangle placement would block another number entirely.
No — Shikaku is a pure logic puzzle with no time pressure. Take as long as you need. MeowBlock tracks your time for the daily challenge so you can compete with friends, but there's no penalty for being slow.