Logic Masters Deutschland e.V.

This is one large puzzle, consisting of six 6x6 sudokus, separated by thick border lines.

Normal 6x6 Killer sudoku rules apply to all sudokus, so every row, column and 2x3-block must contain the digits 1 to 6 and the small numbers in the dotted outlined cage indicate the sum of the digits in that cage. Within a cage all digits must be different.

German whispers loop: Draw one single closed loop that visits each 6x6 sudoku once (so it enters each sudoku at one cell and leaves the sudoku at one other cell). The loop travels horizontally and vertically, but never touches itself, not even diagonally, not even through thick border lines. The loop may not go through killer cage cells. Adjacent digits along the loop must differ by at least 3.

Clues outside the grid indicate the sum of the loop cells in the corresponding row or column of that 6x6 sudoku.

Enjoy solving! :)

The puzzle is also available on Penpa (no answer check).