Normal sudoku rules apply. Numbers in the grid represent the heights of skyscrapers, and clues outside the grid indicate the number of skyscrapers visible in that row or column, looking in that direction. The purple line contains a non-repeating set of consecutive digits, in any order. On thermometers, digits increase from the bulb. The gray line is a palindrome, which contains the same sequence of digits in either direction. Digits in cells separated by a V sum to 5. Digits in cells separated by an X sum to 10. Digits in cells separated by a white dot are consecutive. Digits in cells separated by a black dot have a 1:2 ratio.