Legend has it that Albert Einstein wrote this puzzle, claiming that only 2% of the world could solve it:
In each of five houses in the neighborhood there lives a person with a different nationality, a different favorite food, who has a different hobby and owns a different kind of pet.
Who owns the fish?
Here are the clues: 1. The Brit lives in the red house.
2. The Brazilian owns the owl.
3. The Frenchman prefers grapes.
4. The gray house is on the left of the white house.
5. The owner of the gray house prefers sandwiches.
6. The person who plays the bugle owns the bird.
7. The person in the center house prefers cake.
8. The Indian lives in the first house.
9. The person who plays ping pong lives next to the person who owns the pig.
10. The person who owns the mouse lives next to the person who loves boxing.
11. The person who plays tennis prefers strawberry ice cream.
12. The German loves to conduct his imaginary orchestra at full volume.
13. The Indian lives next to the brown house.
14. The person who plays ping pong lives next to the person who loves shrimp
but is alergic to it so whenever he breaks down and indulges they have to send for the ambulance.
Hint: The owner of the fifth house loves ice cream and plays tennis. This famous puzzle has been updated a little, but the solution remains the same. Getting there, however, is up to the puzzler. You must examine the hints repeatedly, keeping track--in a grid, in most cases--of what is possible and not possible. It can be solved, but it usually takes an hour or so.
The shortest solution we have found on the Web is one by Johanan Rakkav