Here are a few logic puzzles for you to enjoy:

1. The Two Doors: You are in a room with two doors. One door leads to certain death, and the other door leads to freedom. There are two guards, one in front of each door. One guard always tells the truth, and the other guard always lies. You don't know which guard is which, and you don't know which door leads to freedom. You can ask one guard one question to determine which door to choose. What question do you ask?

   Answer

2. The Three Switches: You are in a room with three light switches, each of which controls a different light bulb in another room. You can only go into the other room once. How can you determine which switch controls which bulb?

   Answer

3. The Bridge Crossing: Four people need to cross a rickety bridge at night. They have only one flashlight, and the bridge can only hold two people at a time. The four people all walk at different speeds: one can cross the bridge in 1 minute, another in 2 minutes, another in 5 minutes, and the slowest in 10 minutes. When two people cross the bridge together, they must go at the slower person's pace. What is the shortest time it takes for all four people to get across the bridge?

   Answer

4. The Hat Puzzle: There are three people wearing hats, and they can't see their own hats but can see the hats of the other two people. The hats are either red or blue. They are told that at least one of them is wearing a red hat and at least one of them is wearing a blue hat. They are asked to guess the color of their own hat. The first person looks at the other two and says, "I don't know." The second person looks at the other two and says, "I don't know." The third person, without looking at the others, confidently states the color of their own hat. What color hat is the third person wearing, and how did they know?

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5. The Five Pirates: Five pirates have 100 gold coins that they need to divide among themselves. They have a strict order of seniority, with Pirate 1 being the oldest and Pirate 5 being the youngest. They must decide how to split the gold. The most senior pirate proposes a distribution, and then all the pirates (including the proposer) vote on it. If at least half of the pirates agree on the distribution, it is carried out. If not, the most senior pirate is thrown overboard and dies, and the process repeats with the remaining pirates. The pirates are intelligent and want to maximize their share of the gold. What is the distribution that the most senior pirate should propose to ensure he gets as much gold as possible, while still being fair enough to get at least half of the votes?

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6. The Fox, Chicken, and Grain: You are on one side of a river with a fox, a chicken, and a bag of grain. You have a small boat that can carry only you and one item at a time. If you leave the fox and chicken alone on one side, the fox will eat the chicken. If you leave the chicken and grain alone on one side, the chicken will eat the grain. How can you get all three items (the fox, chicken, and grain) to the other side of the river without any of them being eaten?

7. The Monty Hall Problem: You are a contestant on a game show. You are presented with three doors. Behind one of the doors is a car, and behind the other two doors are goats. You choose one door, and then the host, who knows what's behind all the doors, opens one of the other two doors to reveal a goat. You are then given the option to switch your choice to the remaining unopened door. Should you switch to maximize your chances of winning the car, or should you stick with your initial choice?

8. The Prisoner's Dilemma: Two suspects are arrested for a crime and placed in separate interrogation rooms. The police don't have enough evidence to convict them of the main charge, so they offer each prisoner a deal: If both prisoners remain silent, they will each serve one year in jail for a lesser charge. If one prisoner confesses and the other remains silent, the one who confesses will go free while the silent one will serve ten years. If both prisoners confess, they will each serve five years. What should the prisoners do to minimize their combined jail time, assuming they cannot communicate with each other?

9. The Nine-Dot Puzzle: Connect all nine dots on a 3x3 grid using four straight lines without lifting your pen from the paper and without retracing any lines.

10. The Matchstick Puzzle: You have a set of matchsticks arranged to form a mathematical equation. Move one matchstick to make the equation correct. The equation is: 5 + 5 + 1 = 545.

11. The Four Cards Problem: You are presented with four cards lying on a table. Each card has a number on one side and a letter on the other side. The visible faces of the cards show the following: A, K, 4, 7. You are given a rule: "If a card has a vowel on one side, then it must have an even number on the other side." Which cards do you need to flip over to test this rule?

12. The Three Light Bulbs: In a room, there are three light bulbs in the off position. Outside the room, there are three switches, each controlling one of the bulbs. You cannot see into the room, and you can only enter it once. How can you determine which switch corresponds to each bulb?

13. The 25 Horses Race: You have 25 horses and can only race 5 of them at a time. You don't have a stopwatch, and some horses are faster than others. What is the minimum number of races you need to find the top three fastest horses?

14. The Missing Dollar: Three friends decide to stay at a hotel room that costs $30. They each contribute $10, handing $30 to the hotel clerk. Later, the clerk realizes that there was a special promotion, and the room should only have cost $25. The clerk gives $5 to the bellboy and asks him to return it to the three friends. The bellboy, however, decides to keep $2 for himself and gives $1 back to each of the friends. Now, each friend has paid $9 (a total of $27) and the bellboy has $2, which adds up to $29. What happened to the missing dollar?

15. The King's Poisoned Wine: A king wants to determine which of his three sons should inherit the throne. He gives them a test: he has a bottle of wine with a deadly poison. He tells his sons that the one who drinks from it and survives will become king. The king, however, had secretly labeled the cups. After they've each taken a drink, the king reveals the labels. The first son drank from a cup labeled "Poison," the second son drank from a cup labeled "Wine," and the third son drank from a cup labeled "Poison." None of them died. How is this possible?

16. The Muddy Island Crossing: Four people need to cross a muddy river on a small boat. The boat can only hold two people at a time. It's also very muddy, and anyone who goes across the river must bring a flashlight to avoid tripping in the dark. The four people have only one flashlight, and they all walk at different speeds. It takes one person 1 minute to cross, another 2 minutes, another 5 minutes, and the slowest 10 minutes. When two people cross together, they must go at the slower person's pace. What is the shortest time it takes for all four people to get across the river with the flashlight?

17. The Hat Puzzle Variation: Three people are each wearing a hat. They are told that there are two hats of one color (let's say black) and one hat of another color (let's say white). They are blindfolded and then hats are randomly placed on their heads. Once the blindfolds are removed, they cannot see their own hats, but they can see the hats of the other two people. They are asked to guess the color of their own hat. The first person looks at the other two and says, "I don't know." The second person also looks at the other two and says, "I don't know." The third person, without looking at the others, confidently states the color of their own hat. What color hat is the third person wearing, and how did they know?

18. The Elevator Riddle: You are in a building with 100 floors. You have been given two identical eggs, and you must figure out the highest floor from which an egg can be dropped without breaking. If an egg is dropped from a certain floor and it doesn't break, you can use it again. However, once an egg breaks, it cannot be used again. What is the minimum number of drops required to find the highest floor if you want to minimize the number of drops?

19. The Two Jars Problem: You have two jars, one containing 5 liters of water and the other containing 3 liters of water. You also have an unlimited supply of water. Your task is to measure exactly 4 liters of water using only these jars, without any other measuring devices.

20. The Train Carriages Puzzle: There is a train with 100 carriages numbered 1 to 100. A group of 100 people board the train one at a time. Each person has a ticket with a number between 1 and 100, and they board the train in a random order. What is the probability that at least one person boards the carriage with the same number as their ticket?