Logic Masters Deutschland e.V.

This is my eighth puzzle, To Be Determined.

Rules:

- Normal sudoku rules apply.
- Each clue outside the grid is exactly one of the following three:

1. A sandwich clue, which gives the sum of the digits between the 1 and 9 in that row or column.

2. An x-sums clue, which gives the sum of the digits in the first N cells, where N is the digit in the first cell in that row or column from that direction.

3. A skyscraper clue, which gives the number of skyscrapers that can be seen in that row or column from that direction. For the purpose of this clue, every digit in the grid is considered to be a skyscraper, where 1 is the lowest and 9 is the tallest. Skyscrapers can not be seen if they're behind taller skyscrapers.

There are x-sums and skyscrapers examples at the bottom!

Solve it on f-puzzles | Solve it on CTC (Includes solution)

Correct x-sums examples:

On the left, the 2 in the first cell means that the first 2 cells have to add up to 8. On the right, the 3 in the first cell means that the first 3 cells have to add up to 12.

Correct skyscraper examples:

From the left the 6 is hidden behind the 8 and the 1, 2 and 4 are hidden behind the 9, so only 5 skyscrapers (3, 5, 7, 8 and 9) are visible. From the right the 2 is hidden behind the 4 and the 3, 5, 6, 7 and 8 are hidden behind the 9, so only 3 skyscrapers (1, 4 and 9) are visible.