Logic Masters Deutschland e.V.

Normal sudoku rules apply. Don't make any guesses; only fill in numbers you can logically deduce. Eventually, you will be left with some ambiguous cells that could contain multiple numbers. Shading these cells will reveal an image! I recommend shading all the ambiguous cells red :)
(Click the image to open in SudokuPad)

Or go to https://sudokupad.app/bn4i7xdfuc



Here is an example containing both a solve and solution code calculation: https://tinyurl.com/2t4cf55f

Hint: There are (638/11)-32 ambiguous cells!

PS.
I hope you like solving this puzzle! It requires a wide variety of sudoku techniques! I would love to hear your thoughts about it :)