Rules
- Divide the grid into exactly two regions.
- Each region must be connected horizontally or vertically.
- No 2 × 2 area may belong entirely to one region.
- A clue counts the cells in its surrounding 3 × 3 area that belong to the same region as the clue cell. The clue cell is included.
- The two final colours are interchangeable. Balanced puzzles also require the two regions to have equal sizes, or differ by one cell on an odd grid.
