Usowan

Sample

Progressing

Solution

Rules

  1. Fill in (colored) cells with the following rules.
  2. Cells containing numbers cannot be colored.
  3. The number shows how many colored cells are next to a cell, vertically and horizontally. However, in each rectangle bordered by bold lines, there is one (and only one) wrong number (showing a wrong colored cell number).
  4. Colored cells cannot connect horizontally or vertically. White cells must not be separated by colored cells.

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