Logic Masters Deutschland e.V.

Standard Sudoku rules apply.
Fill in the grid with the numbers 1-9 so that the numbers are not repeated in each row, column, and each 3x3 area (box) separated by a bold line.

Windoku rules apply.
Digits cannot repeat in marked cages (windows).

Disjoint Groups rules apply.
Digits cannot repeat in the same relative cell in more than one box. In particular, the rule also applies to four windows.

Skyscrapers rules apply.
Numbers in the grid represent the heights of skyscrapers, and clues on the arrows outside the grid indicate the number of skyscrapers visible in that row or column, looking in that direction.

Numbered rooms rules apply.
Clues on the squares outside the grid indicate the digit which has to be placed in the Nth cell in the corresponding direction, where N is the digit placed in the first cell in that direction.

XV rules apply.
Digits joined by a V sum to 5. Digits joined by a X sum to 10. Not all Xs or Vs are given.

Play this puzzle on SudokuPad

尝试着诠释过去未来的界限，却忘了身处都市的茧。

Note: The name of this puzzle comes from a Chinese song "凌晨五点半 (5:30 A.M.)", which tells the story of an insomniac who sees a sleepless man on the opposite high floor at the break of dawn, and the two heal each other. If you're interested, be sure to give it a listen.