Logic Masters Deutschland e.V.

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My Variant Sudoku 101 series introduces common variant sudoku rules, frequently using dynamic fog to help point the solver where to look next. The target audience is those who are comfortable with classic sudoku, but new to variant sudoku. In other words, you are expected to be able to identify things like (but not limited to) pairs and triples in rows/columns/boxes and know how to take advantage of them. I welcome everyone to try this series regardless, just be warned you may have a harder time if you're new to sudoku in general.

This is the first quiz in the series. Quizzes will use the 2 most recently introduced rules at the same time, to demonstrate how they can interact with each other. I hope you studied!

Rules:

• Normal sudoku rules apply. Place the digits 1-9 in each row, column, and 3x3 box without repetition.
• Killer Cages: Digits in dotted-line cages must sum to the number in the top left corner of the cage. Digits may not repeat within a cage. If you want assistance with the mental math, you can turn on the "killer calculator" in settings -> advanced.
• Kropki Pairs: Digits separated by a black dot must have one digit be double the other (a 2:1 ratio). Digits separated by a white dot must be consecutive.

Solve on SudokuPad here!

To increase accessibility to my puzzles, I include hints in my puzzle posts (see below). I also post solution videos on my Patreon and YouTube channel. Puzzles released prior to February 2026, as well as my snackdoku and variant sudoku 101 series will continue to get public solution videos on YouTube, while others will be Patreon-exclusive.

Hint 1: The white dot sequence in box 1 has a start an and end, but we don't know which one is the start or end yet. You can still pencilmark them accordingly, having 19 on the ends, 28 next to them, etc. Where does 5 go? You can then use the cage in row 1.
Hint 2: The black dots in box 9 force 579 to be in row 9, which impacts the cages in row 9.
Hint 3: Box 3's 14 cage heavily restrict what the black dot in box 3 can have on it.
Hint 4: Don't forget that each white dot must have an even and an odd number. This comes in very handy to work out what is on the various dots in the right ahd lower-right part of this puzzle.