Tag Archives: rule of 45

Zero Killer Sudoku 10×10

As promised, I am starting posting all sorts of puzzles here on the main page, on a semi-regular basis (2-3 times a week). And since today is Saturday, which used to be the day for Killer Sudoku 10×10 and tomorrow is Sunday, which used to be the day for Zero Killer Sudoku puzzles, quite appropriately, […]
Posted in Free sample puzzles, Killer Sudoku | Also tagged , , , , | 2 Responses

Killer Sudoku on Saturdays!

I should’ve announced this before, but was too busy making the sudoku variants book. So… As of today, every Saturday on the Killer Sudoku page a Killer Sudoku 10×10 will be posted! Almost 8 years after I started posting daily killer sudokus, now there will be a Sumdoku puzzle on Saturdays, too! Remember to add […]
Posted in Killer Sudoku | Also tagged , , , , , | 1 Response

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

Why do I make puzzles? A brief history of Djape.net

A short answer to that question would be: because I enjoy doing it! … but here is a long version, too. Back in the summer of 2005 I realized that it’s about time I had my own website. At that point I had been computer programming for years and it kinda made sense that I […]
Posted in General, Killer Sudoku, Reviews, Samurai sudoku, Washington Post | Also tagged , , , , , , , , , , , , , , , , , , , , , , , , , | 6 Responses

Cage Splitting – Killer Sudoku

Ok, here is the explanation of the “Cage/fence splitting” solving technique for Killer Sudoku puzzles that I promised before. I will use the puzzle posted on Friday, October 7 and solve it step by step using this method. We extend the idea of the “innies” and “outies” solving technique, except that you’re not looking for […]
Posted in Killer Sudoku, Solving tips | Also tagged , , , , , , , , , , , | 2 Responses

The Rule of 45 of Killer Sudoku (innies and outies)

This tip is probably the most important solving technique of Killer Sudoku, one that will save you a lot of time. It does involve some math, but very simple one. Basically, the whole story is that you have to bear in mind that 1+2+3+4+5+6+7+8+9 = 45. Very smart, huh? Well, maybe not so, but it’s […]
Posted in Killer Sudoku, Solving tips | Also tagged , , , , , , , , , , | 3 Responses
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