Logic Masters Deutschland e.V.

Rules:
• Irregular Sudoku Rules Apply (Applies to the centre 9x9 grid)
• The shaded regions on the outside of the grid are extra regions. These also contain each digit from 1-9.
(The Digits in the corners are NOT included in any region)
• Each shaded region's column or row counts the distance to the 1, 3, 7 and 9's within the centre 9x9 grid. Each row or column counts the distance to the SAME digit
(For Example: Every digit in the shaded region in the Top Row counts the distance to only one of 1, 3, 7, or 9. The remaining regions cannot use this number). This is to be deduced by the solver.
• The BLUE LINE is a Whisper Line. Consecutive digits along this line have a difference of 3 or more (1-4, 5-8, etc)
• Killer Cages: Killer Cages must sum to the digit in the top left corner
• Odd and Even: GREEN CIRCLES are ODD Digits. PURPLE SQUARES are EVEN Digits.

Links:
Play on SudokuPad
Irregular Indexing Example
The top shaded region is indexing 4's | The left shaded region is indexing 1's | The bottom shaded region is indexing 3's | The right shaded region is indexing 2's

Additional Thanks: Thank you to Heliopolix for pulling me from the brink of giving up with this puzzle after spending 7 hours losing my mind. They spent the best part of 30 minutes with me, to the point I had found the puzzle still wasn't unique. If it wasn't for them, this puzzle would not exist.