Nuritwin

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Each region contains exactly 2 equal-size blocks of shaded cells.  ·  Numbers show the block size.  ·  No 2×2 shading.  ·  All shaded cells connect.

Puzzle
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▶ How It Works

✗ 2×2 not allowed!

Auto-plays  ·  hover to pause  ·  click dots to jump

✦ About Nuritwin

Nuritwin is a Japanese logic puzzle played on a rectangular grid divided into irregular regions. Your goal is to shade cells so that every region contains exactly two equal-size blocks of shaded cells — the "twins" — while keeping the entire shaded area connected and free of any 2×2 filled squares. Like Nurikabe and Hitori, Nuritwin rewards careful deduction: every cell can be determined logically without guessing.

☰ Rules

1
Two equal blocks per region Every region must contain exactly 2 separate connected groups (blocks) of shaded cells. Both blocks must have the same number of cells.
2
Number clues = block size A number printed in a cell tells you the size of each block inside that region. A region with a "2" clue has two blocks of 2 shaded cells each.
3
No 2×2 shaded squares Four shaded cells forming a 2×2 square anywhere on the grid are not allowed, even if they span multiple regions.
4
All shaded cells connect Every shaded cell on the board must be part of one single orthogonally connected group — no isolated shaded islands anywhere.
💡 Solving tip: Start with regions that have a clue number — the block size is fixed, so you can narrow down which cells to shade immediately. Use the connectivity rule to eliminate cells that would create isolated islands, and the no-2×2 rule to rule out dense clusters.

▶ How to Play

Click any cell to shade it (green). Click it again to unshade. Thick borders show the boundaries between regions — use them as your main guide. When you think you have a solution, press Check to verify all four rules at once; the game will tell you exactly which rule is violated if anything is wrong. Press Solve to reveal the answer, or Clear to wipe the board and start fresh. Use the puzzle selector at the top to switch between the classic 4×4 intro puzzle and the ten generated 6×6 challenges.