Logic Masters Deutschland e.V.

Title: Here's my number--Call me maybe?
Type: Sudoku
Link: Penpa+ link to Here's my number--Call me maybe? Sudoku You may use Normal/Large/Medium/Small Blue, Green, or Red numbers in any combination.
Link: F-puzzles link to Here's my number--Call me maybe? Sudoku
Variants: Sky Scraper, German Whispers, XV, Kropki, Thermometer, Arrows, Palindrome, Killer Cages, Renban

Normal Sudoku rules apply and the following--maybe! There are extra constraints numbered 1 through 9. A constraint is only valid if its digit appears in a grey square; otherwise, it is not valid and CANNOT be true.
There are no negative constraints for XV or Kropki.

0) Sudoku

• Place the digits 1 through 9 once each in every row, column, and box.

1) Sky Scraper

• A digit outside the grid indicates how many digits can be seen as if they were sky scrapers and you were looking down the row from ground level. For Example a 5 clue could see 1 3 2 5 4 8 7 6 9. 2 is smaller than 3 and therefore is not seen. Likewise 4 is not seen as it is smaller than 5. Also, 6 and 7 are not seen being less than 8. So the 5 sky scrapers that are seen are 1 3 5 8 9.

2) German Whispers

• Adjacent numbers along the green German Whispers line must have a difference of 5 or greater.

3) XV Pairs

• 3.1) Two cells adjacent to an X sum to 10.
• 3.2) Two cells adjacent to a V sum to 5.

4) Kropki Pairs

• 4.1) Two cells adjacent to a white dot have a difference of 1 and are consecutive.
• 4.2) Two cells adjacent to a black dot have a ratio of 1 to 2.

5) Thermometer

• Numbers along a thermometer strictly increase the from the bulb.

6) Arrows

• Numbers along an arrow sum to the number in the connected circle.

7) Palindrome

• Numbers along the grey Palindrome line are symmetric about the middle.

8) Killer Cages

• 8.1) Digits in a killer cage add to the total in the top left.
• 8.2) Digits cannot repeat in a cage.

9) Renban

• Numbers along the purple Renban lines must be consecutive, but in any order, and cannot repeat.