Post exactly one robot in every row, every column, and every colored sector.
Robots must not touch each other — not even diagonally.
Tap a square once to mark it ✕ (no robot here), again to post a robot, and a third time to clear it.
Keyboard: arrow keys move around the board, Enter or Space changes a square.
Card 1 of 4: Post exactly one robot in every row, every column, and every colored sector.