hardest puzzles to shake grey matter

Solving puzzles is one of the greatest hobbies one can have. It is also one of the most interesting things to do when you are bored. Do you believe that you have got the best puzzle-solving skills among your peers? Do you feel with certitude that you have a downright acumen to solve abstruse problems and ace through them? If the answer to these was a “yes” with certitude aplomb, then this article is going to be an ego-rattling one for you. So, have a look at the hardest puzzles and let us how whether you have got it in you or not!

1. Sudoku

Hardest Sudoku ever
The Hardest Sudoku ever

Sudoku literally meaning “one number” is the most talked about and one of the hardest puzzles. Our daily newspaper catapulted Sudoku to fame and since then every curious guy’s newspaper’s Sudoku has been riddled with numbers. Everyone has his level at Sudoku ranging from the easy to diabolical, but one guy Arto Inkala, a Finnish Mathematician will make even the evilest Sudoku look pitiable. In 2012 Inkala came up with a Sudoku that is claimed to be the hardest of all the Sudoku grids ever made. According to the famous British newspaper The Telegraph, on a Sudoku difficulty scale where the hardest Sudoku grids fare a horrifying 5, Inkala’s puzzle scored a macabre 11.

2. Einstein Riddle


Einstein is said to have claimed that 98% of the world would never be able to solve this riddle. If you believe you are in that recherché here is one of the hardest puzzles ever:

There are 5 houses in five different colors. In each house lives a person with a different nationality. These five owners drink a certain type of beverage, smoke a certain brand of cigar and keep a certain pet. No owners have the same pet, smoke the same brand of cigar or drink the same beverage. The question is: Who owns the fish?

Did you give up? Don’t worry, we sympathize with you in an opposite manner! As part of our condolences, we present you the solution.

3. Kashikoky Naru

At number 3 in the list of hardest puzzles to shake your grey matter is the Kashikoky Naru. Now let us dig deep in the abyss of the world of logic. Also called “Kashikoky Naru” which translates to “smartness” in Japanese, Calcudoku is a nightmarish Sudoku where mathematical binary operations jump into those small grids (in case you don’t know how it is played, click here). Thought, Calcudoku is devilish in itself, yet some people can never get much of it, a fortiori, Patrick Min came up with the world’s hardest Calculdokus in his book CalcuDoku, 101 Advanced Puzzles (which even include modulo function (Maths to ad nauseum!)).

Fun Quiz!

Elementary School test: Before presenting you with the hardest logic puzzle, let you give you some light moments (beware). Here is a question from Hong Kong Elementary School First Grade admission test.

hardest puzzle
Hint: Play with the figure.

4. Devil!

Hardest Logic Puzzle ever: Published in the Harvard Review of Psychology, this puzzle by Raymond Smullyan certainly requires excessive exhaustion of logic, brain, common sense and intuition. If you have ego problems, we certainly advise you not to go ahead, proscribe your eyes from reading further, because this is not your elementary school puzzle.


Three gods A, R, and C are called, in some order, True, False, and Random. True always speaks truly, False always speaks falsely, but whether Random speaks truly or falsely is a completely random matter. Your task is to determine the identities of A, R, and C by asking three yes-no questions; each question must be put to exactly one god. The gods understand English but will answer all questions in their own language, in which the words for “yes” and “no” are “dam and “ja,” in some order. You do not know which word means which.

So, are you ready to concede? Then as a consolation prize, we present you with this enlightening pdf that answers it all.

These are some of the hardest puzzles that can shake your grey matter within moments. There are some challenging brain games too that can twist your brain in several different directions. Your brain needs a workout too!

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