Tag Archives: how to solve

Binary Puzzles

Here is another novelty: Binary Puzzles, also known as TAKUZU. Binary Puzzles are played on square grids of any even size: 6×6, 8×8, 10×10 etc. Your goal is to fill the grids with 0s and 1s, following these simple rules: 1. There can be at most two 0s or at most two 1s next to […]

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Killer Sudoku 10×10

When was the last time I posted a Killer Sudoku variant puzzle for the first time? I can’t remember. Well, nearly 8 years (I’m a bit slow, you know) after publishing first Killer Sudoku, it occurred to me that there is no reason not to add the 0 into play. So… ladies and gentleman… a […]

Posted in Free sample puzzles, Killer Sudoku | Also tagged , , , , , | 14 Responses

How to solve Diagonal Sudoku X

I realize that I’ve never posted two sudoku solving techniques which are specific to Diagonal Sudoku puzzles. Tweet Here they are. Diagonal and nonet interaction This one is a simple extension of the “row/column and nonet interaction technique”. Just look at this sample puzzle which has been solved using the standard techniques up to this […]

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CalcuDoku for Kindle

KenKen for Kindle

The 10th game for Kindle that I’ve published is: CalcuDoku for Kindle, Kindle Touch, Kindle DX and Kindle Keyboard (all e-ink Kindle devices) You know that these games are know under many different names, including MathDoku, Square Wisdom, Opdoku and other, “official” names. Whatever you call them, the rules of CalcuDoku are always the same: […]

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Hitori puzzle: big and difficult

It’s been a while since I last posted this kind of puzzle. You can read about these “reverse sudoku” puzzles here: – The rules of Hitori – How to solve Hitori This one I’m posting now is going to be a difficult one. I hope. Some have claimed that my Hitori puzzles are not difficult. […]

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How to solve Hitori: basic techniques

Solving Hitori puzzles is about recognizing patterns. I will show you some examples of those patterns. They can be split into two groups, one of those that depend solely on the initial positioning of numbers, and another group of patterns that depend on the black and white cells which have been painted in the solving […]

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UPDATE: After some debate with udosuk (see comments), I’ve decided to adopt the rule that every cell must be either black or white, it can’t be left “undecided”. I’ve changed the original puzzle accordingly so you can download it now. At the end of last year, I announced that I will be introducing more types […]

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Posted in Free sample puzzles, Puzzle variants | Also tagged , , | 7 Responses
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