Peintoeria ("Paint Area") is a logic puzzle published by Nikoli. The puzzle consists of a rectangular grid of any size divided into regions. The goal is to blacken some cells of a grid according to the following rules:
- All cells of a region must have the same color.
- A cell with a number indicates how many black cells are adjacent to it.
- All black cells must form an orthogonally continuous area.
- No 2 x 2 cell area within the grid can have the same color.
Cross+A can solve puzzles from 3 x 3 to 30 x 30.