Nuribou

Nuribou is a logic puzzle invented by Nikoli. A rectangular or square grid contains numbers in some cells. The task is to blacken some empty cells according to the rules:

• The black cells divide the grid in areas of white cells. Each area contains one cell with a number.
• Each area must have the same number of white cells as the number it contains (including the numbered cell).
• Black cells form horizontal or vertical stripes, that must not be orthogonally adjacent. Each stripe must be exactly one cell wide.
• If two stripes are connected diagonally, the length of the stripes must be different.

Cross+A can solve puzzles from 3 x 3 to 30 x 30.