Logic Masters Deutschland e.V.

I published a similar puzzle a couple days ago, but it turned out to have a small mistake and which meant it was not solvable. I fixed the issue and now it should work out. Sorry!

You have been gifted a large collection of puzzles from a friend. You sift through them looking for interesting ones and find a photocopy of a puzzle from an old book of puzzles, filed under "puzzles with no given digits". The original book is nowhere to be found and the photocopy is in black and white.

To make matters worse, in box 3, a coffee stain has covered 3 cells. You suspect there may have been clues under the stain, but you can't make them out. At least you can make out that there are no lines connecting any of those cells to any of the adjacent uncovered cells (e.g. there is no line connecting R1C8 to R1C7).

You can see the photocopy here:

Still, you think it might be solvable regardless. The rules listed for the puzzle are:

Rules:

• Normal sudoku rules still apply.
• Renban: Digits along a purple line form a set of consecutive digits in any order.
• German whispers: Adjacent digits along a green line have a difference of at least 5.
• Equal-sum lines: Box borders divide a blue line into multiple segments which have the same sum. Different lines may have different sums.

What is the original solution to this puzzle?

I have transcribed the puzzle so that it is easier to play:

And finally, you can play it online here!