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.
304
questions
4
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1
answer
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views
The Old Brazen Head
While walking through the forest, on the way to confess to your crush, you come upon an old house. Outside of this house is an old, damaged Brazen Head, with a hastily wired coin-slot appended beside ...
- 1,003
15
votes
4
answers
4k
views
This logic puzzle is impossible!
Rocks always tell the opposite of a statement and Rolls tell the truth.
If I was to tell you the following:
A says C is a roll.
A says there are 2 rocks.
B says they are a roll.
C says they are a ...
- 53.5k
-4
votes
2
answers
120
views
Truths tellers and liars. A short one
On a strange island five people are living.
Of the one half we know: they only speak the truth,
of the other half we know: they only speak lies.
How is that possible?
- 22.6k
7
votes
4
answers
484
views
Get the treasure from an island of knights and a joker
You've learned that there's treasure buried somewhere on a small island, but not exactly where. The island is a perfect circle with a radius of 25 meters. There are 15 islanders there, one of whom is ...
1
vote
2
answers
121
views
Knights and Knaves [closed]
You are visiting an island with two types of people: knights who always tell the
truth and knaves who always lie. From among the thousands of people who live
on the island, you meet six people who ...
- 19
3
votes
2
answers
278
views
A logic puzzle with some lateral thinking
Original puzzle below created by me. The writing is... to be honest, not that good, but it's a puzzle. Focus on the puzzle part.
Your name is John D. Tectif, and you're looking for 4 notorious ...
- 596
1
vote
0
answers
78
views
Truth, error, and random [duplicate]
There are three machines named "truth," "error," and "random" (but you don't know who they are). Among them, "truth" always tells the truth, "error" ...
- 101
1
vote
1
answer
167
views
Find Out Our Numbers (liars and truth-tellers)
You are an adventurer to a distant jungle that the news told you it was full on secrets. But, you could not find anything! So you decided to head home.
When you were almost there, a troll (you ca't ...
- 191
-5
votes
1
answer
190
views
Police Interrogation Puzzle [closed]
I have tried so hard to solve this puzzle. But I cannot get my head around it. I have attempted to eliminate the lies and I have come up with Dave as the criminal. But I do not know if it is the ...
- 1
1
vote
1
answer
164
views
The Truth And Lies Today: Revisited
A man is only capable of telling the truth four hours a day. They are either TTFTT or TFTTT (equiprobable). For the other twenty hours, he lies. All hours between 7pm and 6am are night; 7am and 11am ...
- 191
1
vote
1
answer
162
views
The Truth And Lies Today
Suppose a man only tells the truth three hours a day.
It is the same every week and it is known that the pattern of the truth hours are TFTFT.
(which means he may tell the truth at midnight and 2am ...
- 191
-1
votes
2
answers
113
views
Which day of the week is today (Tuesday, Wednesday, Saturday or Sunday) if one of the statements is false?
Today is neither Sunday nor Wednesday.
Tomorrow is not Sunday or Wednesday.
Yesterday was not Friday.
Monday was not the day before yesterday, neither was Sunday.
Which day of the week is today (...
- 11
4
votes
4
answers
201
views
Constraint Satisfaction Problem: who killed Warren White?
Warren White was found shot dead one morning, police have then investigated who was behind the incident. There were 3 suspects who could be suspects in the incident. That afternoon, the 3 suspects ...
- 41
3
votes
2
answers
379
views
I'm not a robot, I'm not a MONKEY
The city of Roboville has been invaded by robots, monkeys, and dancers, who will dance if the beat's funky. Some of the invaders can be two of them (e.g. both monkeys and robots) and some can be all ...
- 191
0
votes
2
answers
347
views
Is this Among Us logic puzzle possible? [closed]
In 11 Among Us players, some of them are crewmates, who always tell the truth, and imposters, who can either lie or tell the truth. Can you figure out who the imposters are? (There can be any number ...
- 191
5
votes
1
answer
188
views
Sobot or fauxbot?
Through the bustling hallway, you followed your speed-walking, speed-talking brother, who was hoping to submit an article about the upcoming demonstration to his beloved Logic and Philately Semi-...
- 701
4
votes
2
answers
576
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 ...
- 191
3
votes
1
answer
212
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 ...
- 33
6
votes
7
answers
2k
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 ...
- 1,552
-3
votes
1
answer
141
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 ...
- 1,133
4
votes
1
answer
323
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 ...
- 41
7
votes
1
answer
411
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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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 ...
- 6,589
4
votes
1
answer
226
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 ...
- 11.6k
10
votes
2
answers
419
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 ...
- 111
3
votes
1
answer
233
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 ...
- 10.5k
7
votes
9
answers
730
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 ...
- 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 ...
- 26.8k
0
votes
2
answers
333
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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votes
1
answer
323
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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
...
- 121
1
vote
1
answer
243
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 ...
- 121
5
votes
2
answers
235
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.
...
- 634
-7
votes
1
answer
141
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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
...
- 1,003
6
votes
1
answer
260
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 ...
- 1,003
3
votes
1
answer
256
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 ...
- 1,003
1
vote
2
answers
262
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, ...
- 1,003
-1
votes
2
answers
161
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 ...
- 1,003
3
votes
2
answers
311
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 ...
- 133
1
vote
3
answers
580
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 ...
- 807
-3
votes
1
answer
264
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 ...
- 1,552
32
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 ...
- 807
6
votes
0
answers
259
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 ...
- 61
9
votes
3
answers
594
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 ...
- 1,003
1
vote
1
answer
502
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 ...
- 319
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 ...
- 111
7
votes
3
answers
531
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 ...
4
votes
1
answer
330
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 ...
- 1,406
10
votes
3
answers
540
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 ...
- 109
-2
votes
1
answer
111
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
2
answers
211
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 ...
- 1,495