- Exactly one dog in every row.
- Exactly one dog in every column.
- Exactly one dog in every colored area.
- Dogs cannot touch, even diagonally.
Start on an empty cell to draw Xs; start on an X to erase them. Keep your finger down to continue. Double-tap to place or remove a dog. A wrong dog leaves 💩 and costs a bone. Three mistakes end the attempt. With a keyboard, use Space or Enter to mark, and D to place or remove a dog.
