Note: Uniqueness Issue resolved. Top right clue "4" and bottom left clue "3" added to resolve it. Thanks to James McGowan for Pointing it.Fill each and every row,column, and region with numbers 1 to 6.
Additionally, each number in the grid represents the height of the skyscraper in each cell. The digits outside the grid indicate the number of skyscrapers seen from the corresponding direction. Taller skyscrapers hide shorter ones.
Solution: Click here