Questions tagged [liars]

Puzzles that focus on getting information from truth-tellers (who never lie), liars (who always lie), and Jokers (who answer at random).

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2
votes
3answers
1k views

Puzzle to find one good person [duplicate]

There are 15 people who may lie or say the truth(bad people) and 16 people who will always say the truth(good) . Suppose A- bad person , B-good person and C-bad person, when asked about A, B will say ...
9
votes
4answers
1k views

The two neighbouring islands

A puzzle was asked in a mental ability test. Arstil and Byzinte are two neighbouring islands in a far-off corner of the world. The natives of Arstil (the Arstillians) and the natives of Byzinte (the ...
5
votes
1answer
417 views

The truth and lie mess

There are two persons with special traits such that : One speaks only lies and no truth on Monday, Tuesday and Wednesday and all truth rest of the week. The other speaks only lies and no truth on ...
14
votes
2answers
2k views

A Race of Liars

You find yourself in a strange land where a race with five participants has just taken place. Each of the runners is a different age, and each either always tells the truth, always lies, or strictly ...
14
votes
6answers
3k views

To Tell The Truth

Four friends get together. One tells the truth all the time. One lies all the time. One tells the truth on odd-numbered days and lies on even-numbered days. One tells the truth on even-numbered days ...
10
votes
3answers
1k views

The Expedition Into The Ancient Cave

You are a archeologist and have taken 8 of your students on a expedition trip to a ancient cave to try and find ancient treasure. After you and your team entered the cave, you travel as a group ...
7
votes
1answer
3k views

Who are the truth-teller dwarves?

Infomation/Story Your prince is bewitched and asleep. You have to feed him the good apples (from the truth-teller dwarves) to save him. But be careful. Only the truth-teller dwarves, who only tell ...
20
votes
3answers
1k views

Edward and the seven imps' Game

Excerpt of “Manipulating the Fabric of Space” “Miscasting translocation spells can have many nasty consequences. The caster’s body could be warped or torn apart, his soul could be separated ...
15
votes
2answers
1k views

Town of liars and truth-tellers with eccentric mayor

There is a small town with a strange custom. Residents each own a single pebble, painted blue or red, which they always carry in their pockets. Those with blue pebbles always tell the truth, and those ...
6
votes
3answers
414 views

Democrats and Republicans in a Circle

There are $N$ democrats and $N$ republicans sitting in a circle. Each of these people is either always honest or always deceitful. It is known that the number of honest democrats is the same as the ...
5
votes
1answer
501 views

What is the best name for true-tellers, liars and normals

In the world exists a lot of puzzles based on variations of true-tellers, liars and normals (sometimes lies, sometimes not). There are plenty of names for these characters, for example see the ...
16
votes
6answers
5k views

99 doors to death!

You wake up in a small locked room of a huge castle. There are 100 doors, numbers 1 to 100, and you are to open one of them. Open the correct door, and the entire castle is yours to keep. Open any of ...
33
votes
9answers
10k views

Which offer is better?

You are to make a statement. Of these two offers you have to choose one; which one is more profitable to you, and why? If the statement is true, you get exactly 10 dollars. If the statement is false,...
21
votes
3answers
3k views

Ten Tricky Mathematicians

Somewhere on the Hyperbolic Plane, you encounter ten mathematicians. You know that some of them always tell the truth while the rest always lie. Each of them knows which of the others tell the truth ...
6
votes
4answers
6k views

Which color shirt is Andrew wearing?

Andrew and Bob are talking to each other, but we don't yet know who is who. The guy in the blue shirt says, "I am Andrew." The guy in the red shirt says, "I am Bob." If at least one of them lied, ...
7
votes
1answer
684 views

The Beautiful Ladies' Brothers

The ladies mentioned in Five beautiful ladies have five brothers: Adam, Bob, Charlie, David, and Edward. Three have hazel eyes and are honest; two have lime-colored eyes and always lie. You are ...
7
votes
9answers
1k views

Five beautiful ladies

So there are five beautiful ladies whose faces are veiled. You can distinguish them well as they have written their (correct) names Alice, Betty, Cindy, Diana and Emily on their T-shirts. You know ...
4
votes
3answers
811 views

Identify A B & C using the least number of directed logic statements (Knights, Knaves, Normals)

Here is a puzzle I have not yet been able to solve: There are three people A, B and C who know each others identity. You may pick A, B or C show him a logic statement (truth functional compounds ...
6
votes
3answers
2k views

Another village of liars and truth-tellers

There are two kinds of people living in a village: those who always lie (liars) and those who always tell the truth (truth-tellers). Everybody knows each other in the village and therefore knows ...
14
votes
3answers
1k views

Truths, Lies, and Xors

Rusty is a member of the highly secretive Logician's guild. After years of grueling trials, he is now finally allowed to meet the three leaders of the guild. Their names are Truman, Lyle and Xavier, ...
8
votes
1answer
584 views

Dinosaurs and Elephants

There are two species living in the land of Puzzling: elephants and dinosaurs. Elephants always tell the truth when talking about an elephant, but always lie when talking about a dinosaur. ...
6
votes
1answer
3k views

Who is the liar among A,B,C?

Of three persons A, B and C, one always lies while the other two always speak the truth. C asked A: "Do you always speak the truth, yes or no?" A said something that C could not understand. So C ...
12
votes
5answers
1k views

Meta Knights and Knaves Puzzle with Hats

I landed on the island of Knights and Knaves where Knights always tell the truth and Knaves always lie. I set out to find their two leaders, Raymond and Martin and I really wanted to talk with Martin....
7
votes
4answers
766 views

Born to lie, to live, to die

There is a race which has a truth gene. It consists of 3 alleles, namely T, F and O. A person inherits one allele from each of his parents, hence he/she has always exactly two alleles. For example, if ...
3
votes
3answers
847 views

Similar to knight/knave puzzle: Insane asylum

Premise: These are like the knight-knave puzzles; only now we are visiting insane asylums, where there are only patients and doctors. Moreover, each of them are either insane or sane. Sane inhabitants ...
22
votes
2answers
6k views

The village of the liars and truth-tellers

I read this puzzle in an Italian newspaper some days ago. It reported it was asked at one of the latest Mathematical Olympiads. It's not difficult, but it requires some logical thinking. I'm posting ...
-2
votes
1answer
395 views

The true and false babies [duplicate]

There are two babies, the truth baby and the false baby. The truth baby will respond to any question with a true answer, and the false baby will respond to any question with a false answer. The ...
7
votes
7answers
4k views

Who is the horse thief?

Recently there had been horses missing from the stables. The owner barely noticed, until his horse was stolen. He has four suspects but was unable to identify the guilty one. They each gave three ...
30
votes
1answer
3k views

Murdered down the Rabbit Hole (a long logic puzzle)

Backstory Disaster has struck for Leporidae throughout the fantasy realm -- a mass carrot famine has wreaked havoc upon all existences but our own. Because of this, 25 of the leading fantasy bunnies, ...
4
votes
3answers
508 views

Finding a knight with a few jokers thrown in

Much like this other time, you are lost in town and come across a line of $j$ jokers and $k$ knights. You don't know who is who, but they all know the identities of each other. A knight always tells ...
31
votes
12answers
6k views

Knights, Knaves and Normals

In the kingdom of Boolistan, every inhabitant is either a Knight, Knave or Normal. Knights can only make true statements, Knaves can only lie, and Normals must either tell the truth or lie. Warmup: ...
10
votes
1answer
917 views

Who stole my laptop?

It’s obvious that one of my “friends” was lying to me back in March this year. Someone who knew I’d be gone stole my $1,500 laptop and my crappy old broken microwave (I probably won’t ask for that one ...
3
votes
1answer
5k views

Which is the door to heaven [duplicate]

After living a peaceful and calm life, you die a painless death. Your spirit starts ascending into heaven when suddenly you are approaching two doors. Both doors are completely identical and there is ...
2
votes
8answers
3k views

A few simple riddles to get your brain going [closed]

Here are a couple of riddles for you. 1.) Where does twelve plus two equal two? 2.) A man walks up to you and says "If you tell a lie I will stab you with a knife. If you tell the truth I will shoot ...
22
votes
6answers
11k views

Which teacher is the murderer?

In the first day of a new class semester, a student was murdered inside the classroom. No witnesses, no murder weapon, and no evidence. The police got four teachers as possible suspects, but they all ...
13
votes
2answers
3k views

The broken window

A window was broken in my house and I need to find out who did it, can you guys help me? When asked who did it my friends replied with the following in order starting with 1: "I didn't do it" "1 is ...
-1
votes
3answers
200 views

Who is the liar?

Three friends are playing a game of memory, there are a total of 20 cards with 10 card pairs. They try to make the most pairs in a row, after everyone had a turn they make the following statements: ...
11
votes
2answers
579 views

Liar Puzzle with Stack Exchange Users

You are in a chatroom with three Stack Exchange users. They are a Spambot, a Trusted User, and a Moderator, but you don't know who is who; the chatroom only displays their names (user314, user2718, ...
3
votes
2answers
613 views

How does a common man solve impossibly hard truthteller/falsifier questions?

How does one solve the World's hardest puzzle, and other questions of the type? Is there a proper approach to such a question, or does one just have to be incredibly smart to do so? And here's an ...
1
vote
2answers
1k views

What color is the statue? [duplicate]

This question has been tagged as duplicate of Two doors with two guards. What makes this questions different: Let me state the obvious about this question: you meet one islander. you ask one ...
-3
votes
1answer
536 views

3 suspects Logic Puzzle [duplicate]

The following puzzle was posted here, but providing answers to the puzzle was closed without a correct and complete answer being provided: An inspector knows that exactly one of 3 suspects committed ...
20
votes
8answers
11k views

Logic puzzle - 3 suspects

An inspector knows that exactly one of 3 suspects committed a crime, and interviews them to find out which. Each person lies one time, and tells the truth the other time. A says: I did not do it. B ...
25
votes
4answers
9k views

King Octopus and Servants Puzzle

Puzzle: King Octopus has servants with six, seven, or eight legs. The servants with seven legs always lie, but the servants with either six or eight legs always say the truth. One day, 4 servants ...
2
votes
2answers
4k views

Nine togglers, one truth teller, and only a single question

You are standing in front of ten people, one of which is a truth-teller while the other nine are togglers . (A toggler is a person who toggles between the-truth and the-lie for every question asked.) ...
29
votes
13answers
95k views

Three Doors, One Truth-Teller, One Question

You are in a prison. There are 3 doors, and a ghost standing in the middle of the prison. He says one of the doors is the way to freedom while the other two lead to death. You get to ask only one ...
11
votes
3answers
2k views

The 10 Logicians

There are two types of logicians: knights and knaves. Knights will always give a statement that is true whereas knaves will always give a statement that is false. After listening in on a conversation ...
0
votes
0answers
171 views

3 Gods Logic Puzzle [duplicate]

This logic puzzle can be found on the web so NO GOOGLING! You walk up to three gods. One always tells the truth, one always lies, and one randomly decides to tell the truth or to lie and does what ...
11
votes
2answers
789 views

The Three Seers

Your kingdom has been aided, for as long as anyone remembers, by three great seers. These seers are all-knowing and will truthfully answer one question of any person that seeks them. This question ...
5
votes
1answer
830 views

Kill the jokers! - Part 2

The famous and ruthless explorer Wyoming Wilbert reports in the third part of his memoires that he once visited an island inhabited by jokers and truth tellers. Truth tellers always tell the truth, ...
6
votes
4answers
879 views

Knights and Knaves in the Wild West

Late at night at a bar in the Wild West only two cowboys from out of town are left, playing poker with the barkeeper. One of them cheats, so another throws over the table and they have a fistfight (...