Logic Masters Deutschland e.V.

This puzzle was inspired by Fillomenon by Darth Paradox (longest sudoku solve on CtC). I have no desire or expectation to break any records, but I think this is quite hard.

Rules

Fog of war: The grid is covered with fog. Place correct digits to see adjacent squares.

Deconstruction Sudoku: Draw nine 3x3 boxes within the grid and place the digits 1-9 once into each box. Digits within boxes (the Sudoku digits) must not repeat in any row or column of the grid.

Fillomino: Divide the remaining cells (outside of the nine boxes) into orthogonally contiguous regions and fill them according to Fillomino rule: every cell contains the size of its region. Every digit 1-9 is used in at most one fillomino region, and no region is larger than 9. Additionally, a Fillomino digit must not be orthogonally adjacent to an identical Sudoku digit.

Skyscrapers: Consider each digit in the grid as a building of that height. Clues outside the grid give the number of buildings that can be seen from that direction, with larger buildings hiding smaller ones.

Arrows: The digits along each arrow must sum to the digit in the circled cell. Digits may repeat along an arrow if permitted by other rules.

Black dots: Cells separated by a black dot contain digits in a 2:1 ratio.

Play this puzzle on CtC web app