**Chocona** (*"Chocolate"*) consists of a rectangular or square grid divided into regions. The aim is to blacken some cells of a grid according to the following rules:

- A cell with a number indicates how many cells in the region must be blackened.
- In a region without a number any number of cells may be blackened.
- The black cells must form rectangles, independently of the region borders.
- The black rectangles must not be orthogonally adjacent.

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