Logic Masters Deutschland e.V.

Credit for the puzzle name goes to my husband, who saw the layout and thought it looked like a set of university buildings and their quad.

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Rules:

- Normal Sudoku rules apply.

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

- German Whispers - neighboring digits on a green German Whisper line must differ in value by at least 5.

- Renban - a purple Renban line contains a group of consecutive digits in some order.

- Ratio Kropki - digits separated by a black Kropki dot have a ratio of 2:1. No negative constraints.

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Sudokupad