Sum skyscrapers Diagonal rule
Every row and column contains a number only once.
You can't see a shorter skyscraper behind a taller one.
The number outside the grid indicates the sum of heights of visible buildings.
Complete the grid such that every row and column contains the numbers 1 to the size of the grid.
Diagonal Rule: Each of the two main diagonals must contain the numbers 1-N exactly once.
Skyscrapers consists of a square grid. The goal is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row or column. The numbers along the edge of the puzzle indicate the number of buildings which you would see from that direction if there was a series of skyscrapers with heights equal the entries in that row or column.