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I think, therefor I am

The most difficult sudoku in the world

In 2012 mathematician Arto Inkala said he created the most difficult to solve Sudoku. You can try it yourself and see if this is actually true.

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Albert Einstein’s Puzzle – only 2% of all people can solve it

This riddle was invented by Albert Einstein about a century ago. According to him, only 2% of the world’s population are able to solve it. Pretty interesting riddle to play with, don’t you think? Terms of the puzzle: Five houses, each painted in different color. In each house lives a …

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