Tasukuea

Tasukuea (from Japanese, literally "find squares") is a type of logic puzzles. It is played on a rectangular or square grid with numbers or question signs in some cells. The goal is to blacken some cells of a grid according to the following rules:

• Cells with numbers or question signs can not be blacken.
• Black cells form square areas that must not be orthogonally adjacent.
• A number in a circle indicates the total number of black cells in areas orthogonally neighboring the numbered cell.
• A cell with a question sign must have at least one adjacent black cell.
• All the white cells must be connected horizontally or vertically.

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