"Walls" is a Japanese logic puzzle where the goal is to correctly place horizontal and vertical lines in white cells so that the total length of all lines passing through black cells is equal to the number indicated in that cell.
This puzzle is reminiscent of the "Wind Rose",
but differs in that there are no partial lines and the same line can be adjacent to two numbers. Additionally, there may be lines that do not adjoin any number.
Pro? Record a master class and get V.I.P.