Nuritwin

Sample

Progressing

Progressing

Solution

Rules

  1. Shade some cells in the grid.
  2. Each outlined region must contain exactly two blocks consisting of the same number of cells. Each block consists of one or more shaded cells connected vertically and horizontally. A number (if given) indicates the number of cells that form one block in that region.
  3. All shaded cells must be connected vertically and horizontally across regional boundaries.
  4. The two blocks in the same region must not touch each other vertically or horizontally. In addition, no 2×2 group of cells can be entirely shaded.

List of puzzles