Chaotic Skyscrapers/en

Instructions

   

Each row or column contains skyscrapers of different heights (from 1 to n+1 for the nxn grid size); numbers outside the grid indicate how many skyscrapers are visible from that direction.

History

Invented by Roland Voigt (Germany).

Links

http://www.hochhausigel.de/e-varianten.html#chaotic