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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5 votes
2 answers
411 views

You are left on a deserted island with 15 trolls

You are left on a deserted island with 15 trolls and you must identify who is who to leave. A tells the truth (truthful) B lies (liar) C always says yes (yes taker) D always says no (no taker) E says ...
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3 votes
1 answer
161 views

Thieves for questioning

The police got three thieves when they tried to rob a bank. But the officer wants to give them a chance to get free, so he asks them who is the main brain behind the robbery. The thieves were puzzle ...
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  • 33
6 votes
7 answers
1k views

Probability that truth is spoken on Thursdays

A man speaks the truth on only two days a week. The days are the same for each week and they are in the TFT form (TFT = True False True. This means that the days on which he speaks the truth are ...
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-3 votes
1 answer
126 views

2 blue eyes 99 red eyes

There are 101 normal people on an island. 2 have blue eyes and the rest have red eyes. The people with red eyes can leave the island. But the people with red eyes always tell the truth and the people ...
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  • 847
4 votes
1 answer
214 views

Puzzle 1.3 from Montague island mysteries

I'm on puzzle 1.3 "The Missing Painting" in the book Montague island mysteries I'm really struggling to understand the part in Taylor's instructions that says Keep in mind that a ...
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7 votes
1 answer
377 views

Identify someone as a truth-teller, liar or toggler with one yes/no question

You are visiting an island and need some information. The island has liars, truth-tellers, and togglers. Critically, togglers alternate truths and lies in their answers. When you meet someone, how can ...
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  • 79
28 votes
2 answers
3k views

Liar Wordle - Yet Another Wordle Variant!

In Liar Wordle, standard rules apply except each row contains exactly one clue of the wrong colour. For instance if we consider only the first row the correct colours could be Y-B-B-B-Y and the ...
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  • 6,549
4 votes
1 answer
213 views

The age of three ladies

Three ladies A, B and C have a discussion, where each lady says the truth twice and lies once. A: B is two years older than me B: C is 38 years old C: A is older than me B: The age difference between ...
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  • 11.5k
10 votes
2 answers
408 views

How many times do the magicians' coats change color?

In a small town, there live 110 magicians, who can be identified by their magical color-changing coats. These magical coats turn green whenever the wearer tells the truth, and red whenever the wearer ...
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3 votes
1 answer
222 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 ...
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7 votes
9 answers
724 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 ...
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  • 10.3k
24 votes
11 answers
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 ...
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0 votes
2 answers
188 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 ...
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  • 101
-1 votes
1 answer
316 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 ...
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1 vote
1 answer
230 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 ...
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5 votes
2 answers
215 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. ...
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  • 614
-7 votes
1 answer
130 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 ...
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6 votes
1 answer
244 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 ...
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3 votes
1 answer
245 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 ...
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1 vote
2 answers
249 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, ...
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-1 votes
2 answers
158 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 ...
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3 votes
2 answers
299 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 ...
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1 vote
3 answers
548 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 ...
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  • 797
-3 votes
1 answer
261 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 ...
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31 votes
2 answers
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 ...
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  • 797
6 votes
0 answers
249 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 ...
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  • 61
9 votes
3 answers
586 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 ...
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1 vote
1 answer
488 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 ...
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11 votes
4 answers
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 ...
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  • 111
7 votes
3 answers
507 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 ...
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4 votes
1 answer
321 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 ...
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10 votes
3 answers
531 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 ...
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-2 votes
1 answer
108 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 ...
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-2 votes
2 answers
205 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 ...
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1 vote
1 answer
148 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'...
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  • 11
5 votes
2 answers
540 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 ...
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  • 2,223
1 vote
2 answers
179 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 ...
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  • 399
9 votes
2 answers
220 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 ...
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  • 1,137
6 votes
2 answers
433 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. ...
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2 votes
2 answers
276 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 ...
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7 votes
3 answers
682 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 ...
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10 votes
1 answer
257 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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4 votes
5 answers
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). -...
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3 votes
1 answer
442 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 ...
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3 votes
3 answers
428 views

Vampires, Insanity and Transylvanian Sisters

This is a puzzle from this site: https://medium.com/i-math/vampires-insanity-transylvanian-sisters-88ce3516fd I thought it was very nice, so I wanted to share it with you. WARNING: the above link ...
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10 votes
3 answers
717 views

Eight campers and the right path

In the spirit of some of my Raymond Smullyan favorites, here's a relatively hard puzzle from a Dennis Shasha collection of $1988$: Eight kids and their guide are lost on a forest exactly one hour ...
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  • 2,223
4 votes
6 answers
1k views

Who broke the window? [closed]

There is a broken window in the house. I asked who broke the window: Gregory: I was not! April : I didn’t do it. August: April was. June : August says the truth Two of them said the truth, and two ...
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0 votes
3 answers
194 views

City of Lies or Truth [duplicate]

Try to solve this one: You are at an unmarked intersection ... one way is the City of Lies and another way is the City of Truth. Citizens of the City of Lies always lie. Citizens of the City of ...
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  • 1,149
4 votes
2 answers
3k views

Two Truths and a Lie: a logic puzzle

I'm crafting an answer to the game Two Truths and a Lie: each person playing the game says three statements (usually about themselves, though I'm ignoring that requirement for this), two of which are ...
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6 votes
1 answer
275 views

Question which is sort of puzzle from mathematics Exam

I am self studying and trying questions of quantitative aptitude in my mathematics exam and I am unable to solve this problem. Of three persons $A$, $B$ and $C$, one always lies while the others ...
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