Logic Masters Deutschland e.V.

Normal sudoku rules apply. Digits along the indicated diagonal cannot repeat. Digits in cells connected by a black dot are in the ratio 2:1, not all dots are given. In cages, digits cannot repeat. Clues outside the grid are X-sums where the first N digits of the row/column sum to the clue, N being the first digit in that row/column. Once completed, the totals of all the cages (read in normal English reading order) can be concatenated to find the coordinates of the first location.
Next Puzzle

Links:

CTC
F-Puzzles