Towers

Use every height from 1 to the board size once in each row and column. An edge clue counts towers visible looking inward: a taller tower hides smaller towers behind it. A dot means no clue.

For example, 2 → 1 → 4 → 3 shows two towers from the left: 2, then 4. Fixed shaded heights cannot change. Match every edge clue as well as every row and column.

Select a cell, then tap a height. Notes are optional; they never count as placed heights. Turn Notes off to place a tower. Erase removes the selected height or all its notes. Undo retains the last 64 edits. Historical completion does not mean the current board is solved.

Keyboard on the board: arrows move and select, digits place, N toggles notes, U undoes, Delete clears, Escape deselects. No timer or answer-revealing hint.