Think in heights
Towers
Infer a number grid from the visible skyline.
THE OBJECTIVE
Think it through
Place each height once in every row and column. A clue counts the towers visible from that edge: a taller tower hides shorter ones behind it.
YOUR CONTROLS
Make your move
Select a cell, then enter a number. Start with edge clues of 1 and the full grid size.
On a phone, use Touch: mark / reverse for a right-click action. Number puzzles include an on-screen number pad.
Choose an easier or harder grid in Type. Use Undo freely. Reveal solution shows the answer; it is a learning aid, not a hint. The timer starts on your first board interaction and stops automatically when you solve the puzzle. Use Finish practice to save an unfinished attempt. Complete 60 seconds of unrevealed practice with at least 3 board actions for the daily streak. Your last puzzle saves in this browser when device storage is available.
Puzzle engine by Simon Tatham and contributors · MIT licence · Full rules ↗