• 1. Hard Sudoku.

This Sudoku was generated with a special software; I think  this is one of the hardest versions of this popular math brain teaser.
It looks impossible at first, but I guarantee: there is a solution!
It gave me hard time, but I did it!
Can you solve it?

Best places to play Sudoku online:
- Web Sudoku
- Flash Sudoku
- Classic Sudoku
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• 2. Einstein goldfish famous quiz.

The famous and controversial German physic wrote this quiz in the first years of the 20th century, saying that probably 98% of population couldn’t solve it.

Do you think you’re in the 2% of smart people able to solve this riddle ?
Prove it!

In a street there are five houses painted with five different colours. In each house lives one person of different nationality, and each one of these persons drinks a different drink, smokes a different brand of cigarettes and as a different domestic pet.

Clues:

1. The English man lives in a red house.
2. The Swedish guy has a dog.
3. The Danish fellow drinks tea.
4. The green house is on the left of the white house.
5. The owner of the green house drinks coffee.
6. The person who smokes Pall Mall has some birds.
7. The Owner of the yellow house smokes MS.
8. The man who lives in the central house drinks milk.
9. The Norwegian person lives in the first house.
10. The man who Smokes Bluns lives next door to the guy who owns cats.
11. The man with the horses, lives nearby the guy who smokes MS.
12. The fellow who Smokes Blue Masters drinks beer
13. The German guy smokes Prins.
14. The Norwegian man leaves near the blue house.
15. The man smoking Bluns has a next door neighbour who drinks water.

Question:
Who owns the goldfish?
Good work!

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3. Logic Riddle

What’s the logic behind these numbers?

• 1561 156,1 17,3444444444444444444444444444444
• 2,180555555555555555555555555555
• 0,331507936507936507936507857
  Those numbers are in this order for a precise reason.
  can you tell Why?
  Good work!

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• 4. Famous riddle: The wolf, the sheep and cabbage

  

  Charlemagne

  The river-crossing brainteaser is a classic logic riddle. It’s  very old and famous, but still tricky.
  This riddle is so old that dates back to Charlemagne period. In fact the Emperor of the Holy Roman Empire was a big fan of logic and math puzzles and commissioned one of the first puzzle book of the history.The book is called “Problems to Sharpen the Young” and was written with the intent of make math and logical thought more interesting for young people.

  The river-crossing brainteaser was one of Charlemagne  favourite riddle:

  A farmer has to transport from one side of a river to the other  a sheep, a wolf and a cabbage, but he has a boat with only two seats. He has to face a logic problem: if left alone together, the goat will eat the cabbage and the wolf will eat the goat.
  How can the farmer bring to the other side of the river the sheep, the wolf and the cabbage?