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- Towers
- <p>
- Fill in the grid with towers whose heights range from 1 to the grid
- size, so that every possible height appears exactly once in each row
- and column, and so that each clue around the edge counts the number
- of towers that are visible when looking into the grid from that
- direction. (Taller towers hide shorter ones behind them. So the
- sequence 2,1,4,3,5 would match a clue of 3 on the left, because the
- 1 is hidden behind the 2 and the 3 is hidden behind the 4. On the
- right, it would match a clue of 1 because the 5 hides everything
- else.)
- <p>
- To place a tower, click in a square to select it, then type the
- desired height on the keyboard. To erase a tower, click to select a
- square and then press Backspace.
- <p>
- Right-click in a square and then type a number to add or remove the
- number as a pencil mark, indicating tower heights that you think
- <em>might</em> go in that square.
- <p>
- Left-click on a clue to mark it as done (grey it out). To unmark a
- clue as done, left-click on it again.
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