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Trigons book

Here we go, folks! At long last, my first eve TRIGONS BOOK has been published and is available on Amazon!

I’ve posted a couple of Trigons so far – in case you missed them, please try them, they are challenging and enjoyable.

The book is printed with one puzzle per page, so there should be enough space for you to jot down the notes. Altogether there are 100 trigons puzzles which are also known under the name trianglons. Some of them come with pointed tips, some without. A vast majority of the puzzles are using digits 0 to 6, but there are other ones as well, up to 0 to 8!

I really have high hopes for this book. I hope you will like it!

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Sudoku Harakiri book

You may have noticed the covers of some new sudoku books which I’ve published in the last couple of weeks. I haven’t announced them yet, but one I cannot miss.

It’s a first of its kind – a Sudoku Harakiri book!

After two volume of Super Samurai, I’ve decided to change it a bit and bring you a book with Harakiri Sudoku (or Double Samurai Sudoku) puzzles.

There are more books coming soon, so stay tuned for updates!

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Cutting-Edge Sudoku is 44% OFF!

My book Cutting-Edge Sudoku is being discounted 44% on Amazon!

If you are new to my puzzles this is the best opportunity to get introduced to some of the sudoku variants I create.

The book includes the following variations of sudoku:

The book is now JUST $5.62 instead of the regular price of $9.95.

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When is Cheryl’s birthday?

It’s been more than two years since I made a post tagged “brain teaser“. In the last few days I’ve seen a couple of interesting brain teasers which went viral on the internet, so it enticed me to posting one of them.

It’s called

When is Cheryl’s birthday?

and it’s from some test. It is another exercise in lateral thinking. Here it goes:

Albert and Bernard just become friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates: May 15, May 16, May 19, June 17, June 18, July 14, July 16, August 14, August 15 and August 17.

Cheryl then separately tells Albert the month of her birthday and Bernard the day of her birthday.

The conversation goes:

Albert: “I don’t know when Cheryl’s birthday is, but I know that Bernard does not know either.”
Bernard: “At first I didn’t know Cheryl’s birthday, but now I know!”
Albert: “Well, then I now also know Cheryl’s birthday!”

And now you know it, too… or do you? :)

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Trigons with pointed tips

I’m becoming very fond of making Trigons puzzles, so expect lots of them here in the future!

This one I’m posting now is a Trigon puzzle with POINTED TIPS, lonely triangles which share only one side with the rest of the puzzle and the other two sides are not adjacent to any other trigon. In order for this kind of trigons to have a unique solution, there is an extra rule of trigons, which says:

If a trigon shares only one side with the rest of the puzzle, the other two sides of the trigon must be equal, i.e. must be solved using the same number!

Let’s repeat all other rules of Trigons:

The rules of Trigons puzzles

1. For this puzzle, use digits 0 to 6 to solve it.
2. The numbers given in the puzzle represent the sum of the three digits on the sides of the corresponding triangle.
3. Your objective of course is to fill in the numbers on the sides so that they add up to the given sum for that trigon (triangle).
4. Numbers CAN BE REPEATED in any triangle.
5. Each sum combination MUST BE USED EXACTLY ONCE! All triangle sum combinations are given below the grid so when you use one, cross it off.

I’m still working on determining the difficulty of each trigons puzzle, so I still won’t say how difficult this one is – I want to hear from you whether you find it difficult or not. I think it’s a bit easier than the first one.

Free Trigons Puzzle with pointed tips – difficulty UNKNOWN

Click on the puzzle thumbnail to access the puzzle.

Posted in Free sample puzzles, Puzzle variants | Tagged , , , | 5 Responses


Are you ready for a SERIOUS puzzle challenge? :)

These puzzles have been around for a while and they somewhat resemble Tridoku, both in their appearance and in their name. However, trigons are completely different.

These puzzles with lots of triangles are called Trigons and they are not Sudoku. Sometimes they are also referred to as Trianglons. They have something in common with Killer Sudoku, because you are dealing with sums of numbers.

The rules of Trigons are:

1. Use digits 0 to 6 to solve the puzzle.
2. The numbers given in the puzzle represent the sum of the three digits on the side of the corresponding triangle.
3. Your objective of course is to match those sums.
4. Numbers CAN BE repeated in one triangle.
5. Each sum combination MUST BE USED ONCE and not more than once. All triangle sum combinations are given below the grid so when you use one, cross it off.

I will soon start posting tips on how to solve trigons. Basically, start with the 0 and the 18 and then analyze which sum combination can go where depending on the neighboring sums.
DO NOT GUESS! Look for two adjacent sums which differ by a large number – the possibilities are usually very limited. And don’t guess, please! :)

Trigons come in different shapes and sizes and if you have a particular shape which you prefer, please let me know.

Free Trigons Puzzle – difficulty UNKNOWN

Click on the puzzle thumbnail to access the puzzle.

Please help me determine the difficulty. Have I overdone it again?

Posted in Free sample puzzles, Killer Sudoku, Puzzle variants | Tagged , , , , | 8 Responses

Zer0 Killer Sudoku

Ok, I know you prefer Killer Sudokus, but I have to introduce new puzzles every once in a while. So, don’t be mad at me, there is something for everyone on this site!

This time it’s a Killer. And it’s a Zer0. See the 0 in Zer0? It means it’s not a regular Zero Killer Sudoku, but it’s a 10×10 Zero Killer in which you use all 10 digits, from 0 to 9!
The rule of 45 applies, but be careful when you analyze the sums! For example, 3 over two cells can now also be 0+3, not just 1+2!

I tried not to make it too difficult, which means that half of you will complain that it’s too easy. What can I do?

Zer0 Killer Sudoku – difficulty BRAIN

Click on the puzzle thumbnail to access the puzzle.

PDF Version of this puzzle: Zer0 Killer Sudoku puzzle PDF.

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Posted in Free sample puzzles, Killer Sudoku | Tagged | Leave a comment
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