Dominion

Dominion is a logic puzzle created by Naoki Inaba (Japan). It consists of a grid, with letters in some cells. The aim is to blacken some cells of a grid according to the following rules:

• The black cells must form dominoes which can touch each other diagonally.
• Cells with letters are always white.
• The black cells divide the grid into regions of white cells.
• Cells with the same letter belong to the same white region.
• White regions without a cell with a letter are not allowed.

Cross+A can solve puzzles from 4 x 4 to 15 x 15.