Skyscrapers
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Skyscrapers is a number logic puzzle, sometimes called Towers, free to play online. Fill the grid with buildings of heights 1 to N so that every row and column holds each height exactly once, like a Latin square. The clues around the edge tell you how many buildings you can see when looking along that row or column from that side, because taller buildings hide the shorter ones behind them. A 1 means the tallest tower stands right at the edge; a clue equal to the grid size means the heights climb in order. Choose grids from 4x4 to 6x6, or larger custom sizes, at levels from easy to unreasonable. Tap a square and pick a number from the on-screen pad, use pencil marks to track candidates, and undo freely. Your puzzle is saved automatically.
How to play
Tap a square, then tap a number on the pad (⌫ clears). Pencil mode or a long-press adds small candidate notes. Tap an edge clue to grey it out. Keyboard: arrows move, digits enter, Enter toggles pencil, M fills all candidates.
