Brain games: puzzles, riddles, and logical games.
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Two incense sticks Logic puzzles  Weight: 1 Liked the puzzle: 100% 27.12.2009
You have two incense sticks, that burn unevenly, and a lighter. Each will burn for an hour. How can you time 45 minutes using nothing but these tools.
Comments:  4 | check your solution  
An elevator button Logic puzzles  Weight: 1 Liked the puzzle: 87% 12.03.2011
A 12 story building has a single elevator. Two people live on the first floor, four - on the second floor, et cetera. Which button in the elevator is most frequently pushed?
Comments:  1 | check your solution  
Links and chains Logic puzzles  Weight: 1 Liked the puzzle: 100% 02.04.2011
Once upon a time, a Megamind worked as a smith. He was brought 5 chains each consisting of 3 links. What is the minimal number of links that the Megamind should re-lock to make one long chain?
Comments:  1 | check your solution  
Unusual purchase Logic puzzles  Weight: 2 Liked the puzzle: 85% 14.01.2010
Buyer: How much do you ask for one?
Seller: 20 roubles.
Buyer: How much for twelve?
Seller: That will go for 40 roubles.
Buyer: How about one hundred and twenty?
Seller: No problem, that would cost you 60 roubles.
What is the buyer asking for?
Comments:  7 | check your solution  
Two cubes and labels Logic puzzles  Weight: 2 Liked the puzzle: 91% 19.01.2010
You have two cubes and sufficiently many labels with digits 0,1,2,..,9. You have to place one label on each face of each cube so that you can describe any day of the month. The days 1,2 .., 9 should be described as 01,02,...,09.
Comments:  1 | check your solution  
50 coins Logic puzzles  Weight: 3 Liked the puzzle: 100% 27.12.2009
Once upon a time, a tsar was holding a reception and the Megamind was among the guests. The tsar decided to test how smart the Megamind was, took him into a dark room, and gave the following task: On the table in this room, there are 50 coins, exactly 10 of them are tails up. In the darkness, it is impossible to determine the sides of these coins. Touching the coins also does not help. The Megamind has to separate these coins into two groups so that the number of tails in both are equal. Can he do it?
Comments:  4 | check your solution  
A number pattern Logic puzzles  Weight: 3 Liked the puzzle: 60% 05.03.2011
What is next: 13 92 78 12 43 ...
Comments:  1 | check your solution  
A 52 card trick Logic puzzles  Weight: 5 Liked the puzzle: 100% 26.12.2009
A famous magician takes a standard 52 card deck and gives it to the audience. The spectators choose any 5 cards (they may do it any way they like) and pass these cards to the magician's assistant. The assistant announces 4 of these cards out loud. The magician responds by naming the fifth card. Except for the suit and denomination of each card, the assistant passes no other information to the magician. How does the magician "know" the fifth card?
Comments:  8 | check your solution  
A birthday dinner Logic puzzles  Weight: 5 Liked the puzzle: 0% 26.12.2009
A large and merry group of N guys and N girls went to celebrate a birthday in a restaurant. They were randomly seated at a big rotating table by a hurried waiter who quickly took their drink orders. Every girl ordered a wine, and every guys ordered a beer. Bringing the drinks, the waiter brought the right number of beers/wines, but forgot who ordered what and placed the drinks randomly in front of everyone. The party was enraged because more than a half got the wrong drink and demanded to see the manager. The manager appeared and said: "My apologies, but this is not such a big deal. In fact, I can rotate the table without touching the drinks so that more than half of you will get what you ordered." Is the manager's claim correct?
Comments:  1 | check your solution  
Guess your color Logic puzzles  Weight: 5 Liked the puzzle: 100% 26.12.2009
Three MegaMinds enter a room, one by one. Upon entrance, each MegaMind is given a hat that can be white or black. Each MegaMind can see the other two hats, but not his own. After they have spent 5 minutes in the room, the MegaMinds are separated and asked the following question: "What is the color of your hat?" They can say "black" or "white" or simply refuse to answer. If nobody answers or if somebody gives a wrong answer, they will spend the rest of their lives in a dungeon. What should each MegaMind do? What are the chances that they will be set free? There is no preliminary agreement or exchange of any information among them.
Comments:  5 | check your solution  
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