Logic Masters Deutschland e.V.

Twenty Odd Questions is a no-givens variant Sudoku using Disjoint Groups and a mix of familiar constraints.

Normal Sudoku Rules Apply:
Place the digits 1–9 in every row, column, and 3×3 box, with no repeats.

Disjoint Groups:
Cells occupying the same relative position within their respective 3×3 boxes must contain the digits 1–9 exactly once.

Nabner Line (yellow):
Digits on the Nabner line do not repeat, and no two digits anywhere on the line may be consecutive.

Region Sum Line (blue):
For each 3×3 box the line passes through, the digits on that portion of the line have the same sum.

Renban Lines (pink):
Digits on a Renban line form a set of consecutive digits in any order.

German Whispers (green):
Adjacent digits along a German Whisper line differ by at least 5.

Thermometers (gray):
Digits strictly increase from the bulb toward the tip.

Kropki Dots:
Digits separated by a white dot are consecutive.
Digits separated by a black dot are in a 1:2 ratio.
Not all possible dots are necessarily given.

There are no given digits.

I was aiming for a puzzle with a fairly quiet opening and a structural break-in that makes the different constraints begin to interact. No guessing should be required.

Play online:
Solve in SudokuPad

I hope you enjoy it!

More puzzles by me can be found at UncleLogic.com.