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56 62 All the King's Wine So there's this king. Someone breaks into his wine cellar where he stores 1000 bottles of wine. This person proceeds to poison one of the 1000 bottles, but gets away too quickly for the king's guard ... logic mathematical Submitted by Aakash	Hard 7.5
46 72 Charlie and the Chocolate Factory Charlie once visited chocolate factory to buy some chocolates.Chocolate cost Rs. 3 each and he had only Rs. 45.He was disappointed. He wanted more. But when he reached the factory he was amazed. There ... logic Maths Puzzle Submitted by Mikit Kanakia	Easy 2.4
45 12 The Sinking Island You and 3 friends are on an island that is sinking. There is one bridge from the island to the mainland that supports at most 2 people at once. However, it's dark outside so anyone crossing the bridge ... logic brain teaser reasoning Submitted by Ravi	Doable 4.3
28 45 12 Identical Balls You have 12 identical balls. One of them is slightly different in weight than the rest. You have three weighs of a balance scale to determine which ball is different and whether it is heavier or li ... logic brain teaser Submitted by Valentin	Doable 6.2
21 10 Odd Pills Your pharmacist gives you 5 jars filled with pills. The pills contained in each jar have an identical appearance and size (i.e. if you mixed all of the pills you wouldn't be able to tell them apart). ... Math logic deduction Submitted by Jay Elliott	Doable 3.6
19 11 Going to the Track The London racetrack needs to submit its top three horses to the Kentucky Derby next month in order to compete for a prize. However in a recent electrical storm, all the racetrack's previous race histo ... logic mathematics Submitted by Nikhil	Doable 6.2
13 23 Black and White Hats There are 100 prisoners in jail. Their guards decide to play a game with them. Here's what happens: 1) The prisoners are lined up in a single file, front to back, such that the prisoner at the back of ... logic prisoners hats Submitted by Aakash	Hard 8.5
12 3 Choose the Next Letter Choose the next letter in the sequence: O T T F F S S ? logic patterns sequences Submitted by Ravi	Doable 3.8
11 4 Measuring Up You have a 3 and a 5 litre water container, each container has no markings except for that which gives you its total volume. You also have a running tap. You must use the containers and the tap in su ... logic brain teaser Submitted by Ravi	Easy 3.1
9 4 Three Idols Here's a classic: Three gods A, B, and C are called, in some order, True, False, and Random. True always speaks truly, False always speaks falsely, but whether Random speaks truly or falsely is a comp ... logic programming inference Submitted by Aakash	Hard 9.1
8 8 Prisoners and hats 100 prisoners are standing in a line each 1 seeing the back of the ones in front of him. Each prisoner is given a black or a white hat. If they can guess the color of their hat they can go away freel ... logic brain teaser Submitted by Valentin	Hard 8.5
8 225 Non-Adaptive 12 Identical Balls Okay - so I posted this puzzle to reddit a few weeks ago and one guy had the following comment: Same problem, but your solution must be non-adaptive. IOW, specify the weighings that you will make up f ... Math logic unsolved Submitted by Aakash	Hard 9.0
8 1 Attic Lamp Switch A downstairs panel contains three on-off switches. One of them controls the lamp in your attic. Using only ONE trip up to the attic, how do you determine which switch controls the lamp? logic brain teaser Submitted by Valentin	Doable 5.3
7 7 The Neighbourhood People say Einstein suggested that 98% of the world’s population couldn’t figure out the answer to this puzzle. It is not for the faint of heart: There are 5 houses each with a different color. Th ... logic reasoning deduction Submitted by Aakash	Hard 7.5
7 10 Cooking Time A cook must put a souffle exactly 9 minutes at the oven, but he only have a 7 minutes hourglass and a 4 minutes hourglass. How can he measure 9 minutes with those clocks? logic Submitted by Ravi	Doable 5.7