Logic Puzzles

One of the best brain teasers and riddles goes as follows:
There are three switches downstairs. Each corresponds to one of the three light bulbs in the attic. You can turn the switches on and off and leave them in any position.
How would you identify which switch corresponds to which light bulb, if you are only allowed one trip upstairs?
Solution and More Puzzles

Logic Riddles

Brothers and sisters, I have none but this man's father is my father's son.
Who am I looking at?
Solution and More Riddles

Logic Questions

You are shown two doors - one leading to hell and the second one to heaven and only the door guards know what is behind the doors. One guard is always lying and the other is always telling the truth (of course, you don't know who is lying). You can ask only one guard one question.
What question can get you to heaven?
Solution and More Problems

 

Einstein's Riddle

A fellow encountered a bear in a wasteland. Both got frightened - fellow ran to the north, bear to the west. Suddenly the fellow stopped, aimed his gun to the south and shot the bear.
What color was the bear?
Solution and Grid Puzzles

River Crossing Puzzles

Boat

Three missionaries and three cannibals want to get to the other side of a river. There is a small boat, which can fit only two. To prevent a tragedy, there can never be more cannibals than missionaries together.
How could all of them get safely across the river?
Solution and More Similar Puzzles

Water & Weighing

If you had a 5-liter bowl and a 3-liter bowl, and an unlimited access to water, how would you measure exactly 4 liters?
Solution and More Weighing Puzzles

Numbers & Sequences

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year.
What day is my birthday?
Answer and More Number Puzzles

Algebra & Cryptograms

Replace each letter for a unique digit so that the equation is correct.
(J+O+I+N+T)3 = JOINT
Answer and More Alphametics

Picture & Rebus Puzzles

Enter the letters A, B, C and D once in each row and column. The clues outside the grid indicate which letter appears first from that direction.
Brain Teaser Riddle
Answer and More Picture Puzzles

Top 10 Puzzles

You've got 27 coins, each of them is 10 g, except for 1. The 1 different coin is 9 g or 11 g (heavier, or lighter by 1 g). You should use balance scale that compares what's in the two pans. You can get the answer by just comparing groups of coins.
What is the minimum number weighings that can always guarantee to determine the different coin.
Answer and More Top 10 Puzzles

 

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