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. Use Finish & review to record practice time and actions. 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. Use Game → Download save file for a portable backup.
Puzzle engine by Simon Tatham and contributors · MIT licence · Full rules ↗