Why Every Good Puzzle Has Exactly One Solution
For these puzzles, having more than one solution is not allowed, because logic alone cannot choose between them. Here is how generators and checkers make sure there is only one.
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How to Solve Nurikabe: Islands, Walls and the 2x2 Rule
Numbers are island sizes, everything else is one connected wall, and the wall can never form a 2x2 pool. Five deductions that crack most Nurikabe puzzles.
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