Brain games: puzzles, riddles, and logical games.
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Defective balls Weighing puzzles  Weight: 1 Liked the puzzle: 100% 03.02.2011
A Megamind has ordered a set of steel balls for his scientific experiments: 2 red, 2 orange, 2 yellow, 2 green, and 2 blue. The order was fulfilled but the balls of some color were made 1g lighter than the others. The Megamind has a balance scale that shows the exact weight differential between the two cups. He needs to determine the defective color using one weighing. Please, help the Megamind to do this.
Comments:  1 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  
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  
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  
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  
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  
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  
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  
Obtain 24 Algebra, arithmetic  Weight: 2 Liked the puzzle: 100% 27.12.2009
Using numbers 1,3,4,6, and basic arithmetic operations (addition, subtraction, multiplication, and division) and parentheses, obtain and expression that evaluates to 24. You may use only these numbers and only these operations. Every number should be used exactly once. Numbers cannot be concatenated, i.e. you cannot use 13 or 146.
Comments:  7 check your solution  
Two villages Knights, Knaves and Jokers  Weight: 2 Liked the puzzle: 100% 27.12.2009
A Megamind is lost in the mountains. He is standing on a path, shouting for help. Finally, he sees a local approaching. Megamind knows that the locals can be knights that always tell the truth, or knaves that always lie. He also knows that the path leads to the village of knights in one direction and to the village of knaves in the other. The problems is that the knaves are also hateful of Megaminds, and will stone him if gets to their village. How can Megamind ask one question and determine the right way to go?
Comments:  4 check your solution  
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