Logic Masters Deutschland e.V.

Based on the work of Farkov, Jay Dyer and TopAutism (see comments)

Rules:

Normal sudoku rules apply. The first digit in every row, column and box indexes the single marked digit in that set. Consecutive digits do not share an edge. Rows of box indices have equal sums.

CTC link
F-puzzles link

Rule clarifications and examples:

If the first digit in row 3 (r3c1) is a 5, that means the 5th digit in row 3 (r3c5) is marked.

If the first digit in column 6 (r1c6) is a 7, that means the 7th digit in column 6 (r7c6) is marked.

If the first digit in box 4 (r4c1) is a 6, that means the 6th digit in box 4 (r5c3) is marked.

There is only one marked digit in each row, column and box.

Consecutive digits, eg digits with a difference of one, can not border directly either horizontally or vertically. That means if r4c5 is a 3, neither of r4c4, r4c6, r3c5 or r5c5 can be either 2 or 4.

The three rows of box indices sum to the same number. That means r1c1 + r1c4 + r1c7 is equal to r4c1 + r4c4 + r4c7 and r7c1 + r7c4 + r7c7.