Logic Masters Deutschland e.V.

Created as my real self puzzle for Scojo setting impersonation competition. Thanks to NEWS and Calvinball for testing!

Rules:

Normal sudoku rules apply.

Index Lines:

• The value in the Nth cell along a line (starting from the diamond) indicates the position along the line where the value N appears.
• For example, if a diamond cell has a value 3, the third cell along that line must have a value 1.

• Digits in a circle count how many cells (including itself) on that line reference themselves (in other words, the digit in the Nth cell on the line is the digit N).
• For example, 3214 with the 3 on the diamond could have the 2 be circled, because there are 2 digits referencing themselves (the digits 2 and 4 are in the 2nd and 4th place respectively).

• The black dot separates digits where one is double the other.

All feedback (positive or critical) appreciated!