**Irasuto** (*"Illustration"*) is a logic puzzle created by Naoki Inaba (Japan). A rectangular or square grid contains white and black cells with numbers. The goal is to blacken some cells of a grid according to the following rules:

- A number in a white cell represents the number of empty white cells that can be seen from that cell.
- A number in a black cell represents the number of empty black cells that can be seen from that cell.

**Cross+A** can solve puzzles from **4 x 4** to **30 x 30**.