Logic Masters Deutschland e.V.

This puzzle was created for Scojo's weekly setting prompt. This time the prompt was to make a puzzle that takes advantage of phil_the's incredible line curving tool. If you enjoy yourself and want more appendix lines, you can also try this puzzle where I introduced them. Big thanks to Aqjhs and the ctc discord for testing!

Rules:

Sudoku: Place the digits 1-9 once each in every row, column, and box

Quads: A digit inside of a circle must appear in one of the four cells touching that circle.

Appendix Lines: These are like an index line, but with repeating positions. Along a line, if a digit D appears in a Pth position, starting at the large diamond, then the digit P must appear in a Dth position along the line.

Position counting resets after the 9th space. Small diamonds are placed between the 9th and 10th positions along the line, with arrows pointing at the new position 1.

For example, if a line is 14 cells long, and it contains a 3 in the 7th position, then a 7 must appear in either the 3rd or the 12th position.

No digit may act as indexer for more than one position, so if that same line had a 2 in positions 1 and 10 (both of which are indexed by 1s), then you would need a 1 in positions 2 AND 11.

Click the puzzle to play!