Brain games: puzzles, riddles, and logical games.
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Numbers in a square Patterns and correspondences  Weight: 1 Liked the puzzle: 80% 24.12.2011
Place numbers 1,2,.., 9 without repetitions into a 3x3 square so that the sums in all rows, columns, and diagonals are all equal.
Comments:  1 | check your solution  
Vases and beads Patterns and correspondences  Weight: 1 Liked the puzzle: 100% 24.12.2011
A Megamind on his treasure hunt discovered a cave with six ancient vases. Unfortunately, instead of treasures, the vases contained beads. The first vase had 60 beads, the second had 30 beads, the third had 20 beads, and the fourth had 15 beads. How many beads were in the fifth and the sixth vases, given that these number form a certain pattern?
Comments:  2 | check your solution  
One more opening Chess puzzles  Weight: 3 Liked the puzzle: 100% 24.12.2011
Starting from the initial possition White and Black have done 4 moves each. What are these moves? Picture.
Comments:  4 | check your solution  
Flying deep underwater Riddles, jokes  Weight: 0 Liked the puzzle: 33% 02.04.2011
What flies 500 meters below the sea level?
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  
Divide a parallelogram Geometry puzzles  Weight: 5 Liked the puzzle: 100% 02.04.2011
How to divide a parallelogram into 9 isosceles triangles?
Comments:  1 | check your solution  
Indeterminate color Riddles, jokes  Weight: 1 Liked the puzzle: 50% 19.03.2011
A certain subject caught the attention of a walking couple. They started to argue. He said: It's red. She said: No, it's black. He shot back: Yeah? Then why is it white? She replied: Because it's green, silly. What are they arguing about?
Comments:  4 | check your solution  
Laundry Weighing puzzles  Weight: 1 Liked the puzzle: 83% 19.03.2011
A Megamind was doing his laundry. The washer's manual says that a standard load of detergent is 220 g. The Megamind has a bag of dry detergent containing exactly 1 kg, the balance scale, and four weights: 2x10 g and 2x5 g. How can the Megamind obtain exactly 220 grams of detergent using at most three weighings?
Comments:  1 | check your solution  
Sum of all divisors of a square Algebra, arithmetic  Weight: 5 Liked the puzzle: 50% 19.03.2011
Prove that the sum of all divisors of a nonzero square integer is odd.
Comments:  1 | check your solution  
A bear in a window Puzzles for children  Weight: 1 Liked the puzzle: 66% 17.03.2011
A house has four walls each facing South. Each wall has a window. A bear is seen in a window. What color is the bear?
Comments:  1 | check your solution  



 
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