Towers is one of Simon Tatham's portable puzzles. Each square holds a tower; every row and column has one tower of each height. The numbers around the edge say how many towers you can see from that side, because taller towers hide shorter ones behind them.
Every puzzle is generated fresh, in several sizes and difficulties, and pencil marks help you keep track of the possibilities.
Controls
Click or tap a square and type a number (or right-click for a pencil mark). The menu bar has New game, Restart, Undo, Redo and Solve; Type…
Genre
Puzzle, Logic, Numbers, Desktop
Price
Free — no account, no download, nothing to install
Tips for Towers
A clue of 1 means the tallest tower is right next to it.
A clue equal to the grid size means the towers rise one by one from that side.
Use pencil marks to note what each square could still be.