Logic Masters Deutschland e.V.

Two truths and a lie. Each 3x3 box has one liar.

I think the colorful version has more visual clarity, but that might not be true for a colorblind person, or for a person who uses lots of colors to solve this.

Solve in Sudokupad (colorful version)

Solve in Sudokupad (version with fewer colors)

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Rules:

Normal sudoku rules apply. Place the digits 1-9 in every row, column, and 3x3 box without repetition.

Two Truths and a Lie: Every 3x3 box has exactly one liar clue. A clue is a liar if its specific restriction is broken at least once. Each liar corresponds to a different clue type.

XV: Two digits separated by X sum to 10. Two digits separated by V sum to 5. X and V are different clue types.

Killer Cages: Digits in a cage sum to the value given in the top left corner of the cage.

German Whispers: Adjacent digits on a green line must differ by at least 5.

Arrows: Digits along an arrow must sum to the digit in that arrow's attached circle.

Kropki: Digits separated by a black dot must be in 1:2 ratio (one is double the other).

Quadruples: Digits inside a white circle must appear at least once in the four surrounding cells.

Modular-3 Lines: Every sequence of three cells on a thick teal line must contain one digit from each of these sets: 147, 258, 369.

Between Lines: Every digit on a thin line must have a value between the two values in the end circles.