- Prime numbers like 2, 3, 5, and 7 can only form 1×n or n×1 rectangles.
- A 4 can be 1×4, 4×1, or 2×2—consider all shapes.
- Large numbers strongly constrain neighboring rectangles.
- Look for cells that can only belong to one possible rectangle.
- Fill forced placements first, then use them to limit neighboring shapes.
- Remember every cell must belong to exactly one rectangle.
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Play Shikaku Tips
Strategies to play smarter and score higher
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