Logic Masters Deutschland e.V.

This is my puzzle set for this week's setting prompt by Scojo, which called for setting with fog. This is my first fog puzzle. Based on testing feedback, I am marking this as a 2 star puzzle as most of the puzzle should be around this level, however please read the hint below for a sticky patch that is probably harder.

• Normal sudoku rules apply: Place the digits 1 to 9 once each in every row, column and 3x3 box
• Fog: The grid is partially covered in fog. Placing correct digits will clear the fog around that cell, potentially revealing more clues
• All variant clues are standard, i,e,:
• Killer: Digits in any cage can't repeat and sum to the value in the top-left corner, if given
• German Whispers: Adjacent digits along any green line must differ by at least 5
• Region Sum Line: Box borders divide any blue line into segments with the same sum
• Renban: Any pink line contains a non-repeating set of consecutive digits in any order
• XV: Digits on an X sum to 10, digits on a V sum to 5
• Kropki: A black dot separates digits where one is double the other. A white dot separates digits that are consecutive
• No negative constraint, i.e. not all XV or dots are necessarily given.

Play on Sudokupad

Hints

The opening of this puzzle is probably the hardest bit, using an advanced technique...

Consider what the clues mean for 5s...

Specifically, the 6 cage has two fills, but why does a 15 pair not work...

In rows 3, 4, 7...