Logic Masters Deutschland e.V.

Standard Sudoku rules apply.
Each row, column, and region indicated by thick borders in the grid must contain the digits 1 to 9 once each.

Little Killer rules apply.
The numbers on the diagonal are the sum of all the numbers on that diagonal.

Quadruple rules apply.
Numbers in white circle quads must appear in at least 1 of the surrounding squares.
All numbers in a quad are sorted from smallest to largest left-right, and top-bottom. (e.g. [1234], [3366], [1469])

Kropki rules apply.
A white dot joins consecutive digits.
A black dot joins digits in a 1:2 ratio.
Not all dots are given.

Dense Fog of War rules apply.
The grid is covered by a dense fog.
Placing a number in the correct square will reveal ONLY that square.

Play this puzzle on SudokuPad

The answer to life, the universe, and everything.