Logic Masters Deutschland e.V.

Some of you may remember seeing this puzzle on a CTC video about 6 months ago... I've finally got around to uploading it on here now! The aim of this puzzle was to create something thoughtful to mark 11th November - Remembrance Day - featuring an idea I had for drawing poppies in a grid.

Normal sudoku rules apply: place the digits 1-9 once each in every row, column and 3x3 box.

Quadruples: The four digits inside a white circle must appear in the four cells touching that circle.

Kropki: A black dot between two cells indicates that one cell is exactly double the other.

German Whispers: adjacent cells along a green line must have a difference of at least 5.

Renban: the digits in the grey cross are a consecutive sequence of digits without repeats.

You can play the picture version here: https://sudokupad.app/qkmbbu7yux

Or here is a version of the puzzle using only standard sudoku grid markings: https://sudokupad.app/ke5fowgf6r

And you see the CTC solve video here: https://m.youtube.com/watch?v=5nLEZK8Rlys