Logic Masters Deutschland e.V.

Here is something a bit special. A secret 21-way collaboration, led by myself and ChinStrap, to create this bumper pack for sujoyku's birthday.

Sujoyku is a much-loved member of the community, not only one of the most prolific and imaginative setters out there, but also one of the loveliest. His kindness, joy and positivity are contagious to anyone who spends time chatting to him. And I've now had the pleasure of hanging out with him twice in person, and can confirm he pretty much always has a big smile on his face.

This pack is inspired by the 'Up to N' ruleset that he invented. We hope we have found some fun new twists on it, and we wish you joyful solving!

Happy birthday sujoyku!

Rules:

Normal sudoku rules apply.

UP TO N: A clue panel (outside the grid) by row N or column N gives the total of any digits that occur before the digit N in that row or column, seen from the direction of the clue (and not including the digit N).

MYSTERY CLUES: The numerical contents of the clue panels must be deduced. Any empty panel represents some number greater than 0. A '?' indicates the number is between 1-9. A grey circle indicates the number is odd.

RENBANS: A pink clue panel indicates that the 'up to N' sum (not including N itself) forms a renban: a set of consecutive digits that can be arranged in any order.

NABNERS: A yellow clue panel indicates that the 'up to N' sum (not including N itself) forms a nabner: no two digits anywhere in a nabner may be consecutive.

DIAMOND DIGITS: An empty clue panel being pointed at by an arrow can have its clue determined by summing the 'diamond digits' along the arrow that points at it. Discover diamond digits by solving lots of mini puzzles!