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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 , , , | 4 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 , , , , | 7 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.

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

Number Fill-Ins

I’ve been quiet for some time because I’ve been working on my thesis diligently. Anyway… it’s time for a new free sample puzzle for you. :)

This time it’s a number fill-in puzzle. I started making them only recently, so I’m very keen to hear from you how you like them. Is this puzzle I’m posting now too easy or too difficult or just right?

The rules of fill-ins are simple: fill the grid with the numbers listed below. Each number must be used precisely once. You must place them either horizontally or vertically. Just like in crosswords, but here you are crossing the numbers instead.

How do you proceed in solving them? Well, you must start with a little bit of “what if”. For example, in this puzzle there are only 2 numbers with 10 digits. See where they can fit in the grid and check the perpendicular intersecting sequences to see if there are listed numbers that conform with the 10 digit number. In other words, is there another number that can be crossed with the 10 digit number. If there isn’t, it means that the 10 digit number must go into the only other possible spot in the grid.

So… here it is… please comment if you like it or not and how difficult was it for you.

Free Number Fill In puzzle

Click on the puzzle thumbnail to access the puzzle.

PDF Version of this puzzle: Number Fill-Ins puzzle PDF.

Posted in Free sample puzzles, Puzzle variants | 2 Responses

New volumes of the most popular sudoku books

Well, it’s time to announce new volumes of the 4 of my most popular sudoku book series. Instead of bothering you with multiple posts, I decided to put all 4 of them in one.

So… without further ado, ready for your holiday gifts, here they are:

Posted in Jigsaw Sudoku, Killer Sudoku, Puzzle books, Samurai sudoku | 1 Response

Happy Holidays (30% OFF!!!)

Well, folks, the holiday season has now officially started. To those of you who celebrate today – I wish a very Happy Thanksgiving! :)

Apparently folks at Amazon are also celebrating with all of us and they are offering 30% off any book! To redeem this offer, use coupon code HOLIDAY30 at checkout. The promotion is valid for a limited time only, from November 26, 2014 at 9pm PST to November 30, 2014 at 11:59pm PST.

Here are the full terms of this offer.

So, click on any of the covers of my books and use the coupon code HOLIDAY30 to get 30% off. Here you can see a list of all new releases of my puzzle books.

One book I’d like to make a special announcement for: it’s volume 2 of the Coloring books series by Anna and myself. This is a great opportunity to buy this book with 30% off. The coloring pages in this book are filled with illustrations of flowers, animals, ornaments, other objects, scenery and abstract drawings. So it is much more detailed than the first one, which was full of coloring patterns and tessellations. I think this new one is even more beautiful than the first one. So, go get it, you won’t regret it! :)

To celebrate with you, I am showing you one sample page from the book. It’s low res here, in the book they are beautiful and large 8″x10″ pages!

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Posted in General, Puzzle books | Leave a comment
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