### Context

**Context** is a rectangular or square grid with numbers in some cells. The aim is to blacken cells of a grid according to the following rules:

- All the white cells must be connected horizontally or vertically.
- A cell with a number can be blacken. Two black cells must not be orthogonally adjacent.
- The number in a white cell indicates the number of orthogonally adjacent black cells.
- The number in a black cell indicates the number of diagonally adjacent black cells.

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