Logic Masters Deutschland e.V.

Normal sudoku rules apply. In addition:

Region Sum Lines: Blue lines are region sum lines. Each time a blue line passes through a box, the sum of the digits on the line within the box must be the same. The sum applies to each individual visit a line makes to a box. Different lines may have different sums. (There are two distinct region sum lines passing through box 5.)

Arrows: The digits along each arrow must sum to the digit in the circled cell.

Kropki: Cells connected with a white dot must be filled with consecutive digits. Not all white dots are necessarily shown.

F-puzzles: https://f-puzzles.com/?id=285f6vbz

CTC: http://tinyurl.com/5ambr9th