Logic Masters Deutschland e.V.

Place the digits from 1 to 9 once each in every row, column, and box.

Sequence line: Digits on the grey line must be in order and the difference between adjacent digits must be constant throughout the line.

Modulo 3 line: Three contiguous cells on the dark green line must all contain digits that have a different remainder when divided by 3.

Entropic Line: Three contiguous cells on the peach coloured line must all contain a low (123), middle (456), and high (789) digit.

Modulo 4 line: Four contiguous cells on the red line must all contain digits that have a different remainder when divided by 4.

Renban: Digits on the purple line may not repeat and form a set of consecutive digits.

German Whisper: Adjacent digits on the light green line must have a difference of at least 5.

Dutch Whisper: Adjacent digits on the orange line must have a difference of at least 4.

Digits seperated by a black dot must have a ratio of 1:2.

Digits seperated by a white dot must be consecutive.

PLAY HERE: CTC