Rules: Place one or two digits from 1 to N+1 into each cell of the square grid, where N is the length of the square's side, so that each number appears exactly once in each row and column. One cell in each row and column must contain two digits. Each number inside the grid represents a skyscraper of its respective height. The outside clues indicate the number of skyscrapers visible in that direction, Smaller skyscrapers are hidden behind taller ones. Cells containing double digit numbers house two skyscrapers - the taller skyscraper always behind the shorter one (from all applicable viewing standpoints).
About: This variant was invented by Anurag Sahay.
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