Logic Masters Deutschland e.V.

This puzzle was created for Scojo's Setting Saturday prompt, courtesy of Dorlir, that no clue type appear more than once in the puzzle.

Sudoku: Place a digits from 1 to 9 into each cell of the grid such that no digit repeats in any row, column or 3x3 box.

The four question marks outside the grid, as well as the circle of the arrow represent the same value.

Each question mark corresponds to exactly one of the following standard clue types.

Sandwich: This clue indicates the sum of the digits between the 1 and 9 in that row or column.

Skyscraper: This clue indicates the number of visible digits in the direction of the clue, where a digit is visible if it is greater that all previous digits in that direction.

Numbered Rooms: The value of this clue will be placed in the Nth cell in the direction of the clue, where N is the digit adjacent to the clue.

X-sums: This indicates the sum of the first N digits in the row or column where N is the digit adjacent to the clue.

Standard clue types inside the grid are as follows:

German Whisper(green): Digits along green lines differ by at least five.

Dutch Whisper(orange): Digits along orange lines differ by at least four.

Renban (pink): Along pink lines, digits may not repeat, and form a set of consecutive digits in some order.

Region Sum (blue): 3x3 Boxes divide the blue line into segments of equal sum.

Arrow: The circled cell contains a digit equal to the sum of digits on the connected arrow.

Positive Diagonal: Digits may not repeat along the thin blue line.

Ambiguous clue types:

Diagonal Kropki: On one of the grey dots, the digits diagonally opposite each other must be consecutive. On the other, they must be in a 1:2 ratio.

Min/Max: For cells with a jagged edge, one must be less that all cells sharing an edge, and the other must be greater.

Parity: One octagon is an even digit, and the other is odd.

Solve on CTC