Questions tagged [liars]

Puzzles that focus on getting information from truth-tellers (who never lie), liars (who always lie), and/or Jokers (who answer at random), or which use such characters as an integral part of the puzzle.

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3
votes
1answer
188 views

Choose your guardian wisely!

I must issue a word of caution dear traveler. As your journey nears its end, you have one final obstacle to overcome. Ahead lies the gate of the guardians. As you might suspect, the gate is protected ...
7
votes
9answers
656 views

The Land of Truth and Lies [closed]

You live in The Land of Truth and Lies, where any of your statements may be inverted in meaning, without prior warning. For example, if you intend to say "You're looking good today", you may ...
20
votes
11answers
6k views

Who robbed the store?

You are investigating a shop robbery. The CCTV footage shows that there was one criminal, but it doesn't show their face. There are 10 suspects and you know that one of them is the criminal. The ...
112
votes
16answers
1.3m views

Two doors with two guards - one lies, one tells the truth

You are a prisoner in a room with 2 doors and 2 guards. One of the doors will guide you to freedom and behind the other is a hangman–you don't know which is which. One of the guards always tells the ...
0
votes
2answers
159 views

How many liars were there at the party? [duplicate]

Andy’s birthday party has just been moved up by a week. All the toys in Andy’s room are worried about being replaced by fancy new toys. Sheriff Woody, Andy’s favourite toy, and the others are waiting ...
4
votes
5answers
1k views

One truthteller/liar and one random person

You come across two peculiar aliens: Alice and Bob. You know the following about them: -Alice is either a "truthteller" (she always tells the truth) or a "liar" (she always lies). -...
-1
votes
1answer
295 views

A one liner question for marriage to a beautiful girl [closed]

Question: One day I saw an extremely beautiful lady on this island which consisted of only knights (that always are truthful) and knaves (that always lie) and was immediately smitten with her. I ...
1
vote
1answer
192 views

Magicians, Knights and Knaves

My solution for this puzzle did not well match with the book's solution. I thought it would be good to check my argument's reasoning, though you can also propose your own answer. There is an island ...
1
vote
2answers
231 views

Organs of the Enterpeton

An enterpeton has arrived at the bathhouse. Enterpetons are strange reptiles with exposed organs. Four of these organs can answer questions, and follow certain rules. These organs are: the heart, ...
-7
votes
1answer
107 views

The Ultimate Liars

At the bathhouse, 27 travellers arrive. According to a book they have brought, each one follows a different one of the following rules: Traveller Yes Unknown No Sheep Y Y Y Knightly Sheep Y Y R ...
4
votes
2answers
175 views

Knight-Knave-Normal Meta-Knowledge

A traveller visited one of the islands described by Raymond Smullyan on which all inhabitants are either knights, who always tell the truth, knaves, who always lie, or normals, who can say anything. ...
6
votes
1answer
208 views

The Serpent-Tail

After defeating the octangular spirits, you find yourself needing some laundry powder. However, you can't find any at your usual shop, and so you have to ask one of the employees, who happens to be a ...
3
votes
1answer
220 views

The Eight Spirits

After your ordeal with the enterpeton, you need the toilet. Unfortunately, your ability to urinate has been stolen by one of the octangular spirits, a set of spirits that follow strange rules. The ...
-1
votes
2answers
148 views

The Rainbow Serpents

At your bathhouse job, you encounter a pair of rainbow serpents, each having two heads, hiding behind a wide pillar. They seem to be bent around the pillar with a head from each serpent visible on ...
3
votes
2answers
265 views

Cursed Knights and Knaves

You are packing up after a week-long stay at the Verity Inn. You came here, to Truth Town, to visit your friend but now it's time to go home. You feel in good spirits as you pack your bags. As you are ...
4
votes
10answers
3k views

Choose the right door for golds

Choose the right door for golds. Do it very carefully. If you choose the wrong door you will be dead.
3
votes
1answer
394 views

Murder Mystery Question from an Entrance Exam

Here is a question I've been having some trouble with. I'd love any of your thoughts. It is Question 3 in this entrance exam. Mr Cadbury was murdered last night. Exactly one of six suspects is ...
0
votes
3answers
512 views

The Third Hardest Logic Puzzle in the World

This puzzle is heavily derived from the Second Hardest Logic Puzzle in the World, which I also created. The current puzzle and the aforementioned are not identical, however. You have 5 guards: one ...
-3
votes
1answer
248 views

How can a liar and a truthteller prove their identities? [closed]

You come across two people. One is a liar who always lies and the other is a truthteller who always tell the truth. You don't know who is who though. Both these people are allowed to say one sentence ...
31
votes
2answers
3k views

The Second Hardest Logic Puzzle in the World

This puzzle is an original creation of mine (as far as I know), although other people have solved it before me. You meet five people: Alice, Bob, Carol, Daniel and Evie. Your aim is to ask yes/no ...
16
votes
2answers
2k views

Knights and knaves in a foreign language

You die and ascend to heaven, there is a knight (truth-teller), a knave (pure liar) and a joker (random) sitting on a cloud - they all look the same. In order to gain entry you must determine their ...
13
votes
4answers
7k views

Who is the thief? An elementary school teacher had her purse stolen

This puzzle is not mine, but I couldn't find an original source. I edited it somewhat. An elementary school teacher had her purse stolen. The thief had to be Sammy, Karin, Arnold, Harry, or Liza. ...
13
votes
4answers
40k views

Two doors with three guards - one lies, one tells the truth, and one is unreliable

This is an extension of Two doors with two guards - one lies, one tells the truth, but in this situation you are a prisoner in a room with 2 doors and 3 guards. One of the doors will guide you to ...
5
votes
0answers
230 views

Trying to find a 2020 puzzle hunt with a puzzle based on Among Us

I am trying to find a puzzle hunt that I believe was held in 2020. It contained a puzzle based on the game Among Us with 26 characters, and you had to decide who were the imposters. The imposters all ...
9
votes
3answers
553 views

Which Demon Spoke?

While wandering, you encounter a pond, in which two demons are bathing. One is labelled 'honest', meaning they always tell the truth, and the other is labelled 'liar', which means they always lie. As ...
23
votes
4answers
3k views

On which day The Joker usually going on a date?

You are an investigator. You are to investigate The Joker to know on which day he usually goes on a date with Harley Quinn. The Inspector said that The Joker is lying if and only if it's Monday, ...
1
vote
1answer
463 views

Knight or Knave

On the island of knights and knaves (where knights always tell the truth and knaves lie), you meet two islanders named Penny and Quinru. Penny: Both Quinru and I are knaves! Who is a knight and who ...
11
votes
4answers
2k views

Who is the liar (Number of liars)?

There are 5 people. Each one can be lying or telling the truth, and they can't switch. Below, each person tells us how many liars exist in the group. There are at least 3 liars. There are at least 2 ...
12
votes
5answers
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 ...
7
votes
3answers
472 views

Can you find and capture a shapeshifter?

A town was invaded by aliens, and some of its residents were kidnapped and replaced by shapeshifters. You're tasked with capturing one of the shapeshifters. Here's the setup: There are 7 residents of ...
25
votes
12answers
6k views

Kill the jokers! - Part 1

The famous and ruthless explorer Wyoming Wilbert reports in one of his books that he once visited an island inhabited by jokers and truth tellers. Truth tellers always tell the truth, whereas jokers ...
4
votes
1answer
292 views

Trapped in an escape room with 2 liars

You are in a room, with 6 people. 2 of them are liars. The room has a code pad. The people say: People What they say Keith The first and last digit are the same number and are not used anywhere else ...
9
votes
6answers
5k views

Solve the following knights and knaves problem

A says: “B is a knave.” B says: “A and C are of the same type.” Knights tell the truth and Knaves lie. What is C? (i.e. a knight, or a knave?)
4
votes
8answers
745 views

Two doors, two guards, and two keys

Table of contents Introduction - read about where the puzzle comes from. The puzzle - read the puzzle itself. Warming up - read about solutions to a simpler variation of the puzzle. Introduction (...
4
votes
5answers
990 views

About Knights and Knaves and their consistency

On an Island of Knights and Knaves (where Knights always tell the truth and Knaves always lie), a Knight will never contradict himself unless some true fact changes. I was wondering: can a Knave ...
3
votes
2answers
130 views

Five possible liars - any way to solve with a grid-based method?

The situation is as follows: At a semiconductor laboratory in Hsinchu a security guard caught five technicians accessing a high level security area reserved for the most trusted scientists working in ...
45
votes
10answers
18k views

Puzzle: Who hacked the computer?

I was working my way through some Knight and Knave Puzzles in Discrete Maths by Rosen, when I came across the following question: Four friends have been identified as suspects for an unauthorized ...
7
votes
3answers
647 views

One truthteller, one liar, and two randoms - least questions to identify?

I have landed on a new planet and there are 4 people there. One of them is a truth teller and they always speak the truth. The other is a liar and they always lie. The other 2 are random and they ...
10
votes
3answers
474 views

We have captured 5 spies. Their names are A, B, C, D, and E

This is a variant of the puzzle here. We have captured 5 spies belonging to a secret organization. Their identities are unknown; we only know them by their codenames A, B, C, D, and E. After thorough ...
-2
votes
1answer
106 views

Is asking your one question by doing an action an answer to the two doors, two guards puzzle? [closed]

Is asking your one question while doing an action an answer to the two doors, two guards puzzle? Example: You ask your one question by moving towards any door. Only the true guard will continue to ...
-2
votes
2answers
189 views

How many children wear a yellow t-shirt?

The puzzle is as follows: In a certain kindergarten there are 23 children. Some of them wear a green t-shirt, others a yellow t-shirt and others blue t-shirt. A tv reporter who was on the site doing ...
1
vote
1answer
139 views

Knight can't answer about joker

If you ask a knight (True) about a Joker's answer (random), then she can't answer because she doesn't know? Does this give a NaN response or is it not allowed? I looked at similar questions and couldn'...
5
votes
2answers
517 views

The wrapping machines of Santa

Christmas is coming and Santa is working hard to wrap all the presents until the 24th of December. He has six wrapping machines: A, B, C, D, E and F, that work $24/7$ all at the same time. But the ...
26
votes
3answers
2k views

A Space Station 13 tricky situation

You are the Captain of the Space Station 13, and everything went bad very quickly. Most of the crew died, and it took you not so long to figure out that some people are not who they're supposed to be (...
1
vote
2answers
156 views

Guess the hat colors - Riddle 6

And for today, a new original hat guessing puzzle! CHALLENGE: Guess the hats of the 4 prisoners. SPECIAL RULE: One of the prisoners is lying DESCRIPTION: Each one can see the hats that are in front ...
12
votes
3answers
889 views

A Space Station 13 complicated escape

After successfully resolving this tricky situation, you, the Captain of the Space Station 13, have ordered what remains of your crew to gather in the escape shuttle. Accompanied by the Security ...
9
votes
2answers
213 views

Great puzzle makers of yore: #1, Martin Hollis: "The Poacher's Funeral"

When Peter the Poacher died, his six direct descendants all came to the funeral, each being a son, grandson or great-grandson of the old reprobate. The "Chippings Post" sent a man to compile ...
6
votes
2answers
416 views

2 weird problems I came across

A man accused of murder hires a lawyer who is always believed by the court to be telling the truth. The prosecution's attorney says that if the accused man committed the murder, he had an accomplice. ...
3
votes
2answers
255 views

The ice cream puzzle

I am a new user, and I made this puzzle myself, but I lost the answer key, can anyone solve it so I can make a new one? The owner of the ' Super Ice Cream' shop was terrified. One of his workers was ...
10
votes
1answer
230 views

Mirror, mirror on the wall, who's the fairest of us all?

Three evil queens, accompanied by their magic mirrors, go for a girls' night out. At some point of the night they decide to finally settle the eternal question: who's the fairest of them all? Of ...

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