Goal

Each square holds a skyscraper. Fill in every building's height so the clues around the edge are right.

The rules

• On a 4×4 grid, heights are 1 to 4 (1 to 5 on 5×5). Each row and each column has every height exactly once.
• A clue on the edge says how many buildings you can see from there, looking along that row or column. Taller buildings hide shorter ones behind them.
• For example, the row 2 1 4 3 seen from the left shows two buildings: the 2, then the 4. The 1 hides behind the 2 and the 3 behind the 4.

How it works

• Tap a square, then a height. ⌫ clears it. A shaded bar shows each building's height.
• A clue fades once its line is full and correct, and turns red if the line is full but wrong.
• Every city has exactly one solution.

Tips

• A clue of 1 means the tallest building is right next to it.
• A clue equal to the grid size (4 on 4×4) means the heights rise 1, 2, 3, 4 in order from that side.
• A high clue means short buildings near that edge; a low clue means a tall one close by.