Logic Masters Deutschland e.V.

My first attempt at setting a sudoku! I'm pretty proud of the result I reached, I think there's some really interesting logic and it's not a type of puzzle I've seen often.

The inspiration for the logic is a puzzle I know as Keen, from Simon Tatham's puzzle collection. It's a really fun sudoku variant but the computer-generated ones often end up not being terribly interesting. I hope what I've made will be a bit more challenging!

Place the digits 1-9 in each row and column of the grid. Fill the grid with cages such that all cages contain at least two cells and do not overlap.

Clues indicate the product of all the digits in their cage. No cage can have more than one clue, but not all cages have clues. A question mark can be any number.

Digits may repeat in cages, and no two cages contain the same combination of digits.

Sudokupad link