Logic Masters Deutschland e.V.

For the 2024 CTC Secret Santa, I was assigned to RockyRoer. I created three puzzles so that I could stretch my skills a little more and give Rocky a worthy Christmas gift. I hope everyone had a beautiful holiday and a splendid New Year!

Rules:

- Normal sudoku rules apply.

- Gray circles - the gray circle contains an odd digit.

- German Whispers - digits along a green German Whisper line must differ in value from their neighbors on the line by at least 5.

- Modular lines - each set of three digits along a red modular line must have include 1 digit from [1,4,7], 1 digit from [2,5,8], and one digit from [3,6,9].

- Numbered Rooms - clues outside the grid indicate the digit which has to be placed in the Nth cell in the corresponding direction, where N is the digit placed in the first cell in that direction. Example: If 2 is the outside clue on the left of R1C1 is 8, then 2 must be placed in R1C8.

- XV sums - digits separated by an X sum to 10; digits separated by a V sum to 5. No negative constraint.

- Kropki dots - digits separated by a white Kropki dot differ in value by 1. No negative constraint.

Sudokupad link.