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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7
votes
4answers
1k views

Knight and knave impostors!

While on some adventure, you are transported away from your companion magically. Your companion, confused, enters a nearby building that suddenly materialised overnight. Inside the building there is ...
10
votes
5answers
602 views

Liars of El Dorado

After a lifetime of searching, you have discovered the legendary city of El Dorado. You are approached by three inhabitants. You know from your research that these are the three highest ranking ...
7
votes
2answers
680 views

What did he say he said? Liars with a twist!

5 shy dudes who can never talk for themselves stand in a circle. Every time you ask one of them a question, the dude to their right will answer for them. 3 of them always lie and 2 of them always tell ...
-1
votes
3answers
203 views

Boxed AI, Ethics, and Chivalry, oh my

(Inspired by this somewhat) So, your science lab is on the forefront of super AI. However they may not be on the forefront of good AI. Hence the AI is in a box until they can figure out what to do ...
22
votes
4answers
2k views

Art Accident at Airport!

There was an accident at the airport! A hanging art installation fell and landed on some passengers. In addition to tearing up all their tickets and mixing up their luggage, six people sustained ...
11
votes
2answers
1k views

Name the trolls

TL;DR There are 11 trolls named and you should discover their names by asking yes-or-no questions to them, directing each question to one troll. You must use the minimum possible number of questions. ...
3
votes
1answer
334 views

The Lying Servers

You have 4 servers which accept a positive number from 0 to 255 (8 bits). Each server takes it's input, performs a basic addition or subtraction of a single digit, non-zero number, and outputs the ...
10
votes
3answers
506 views

Convoluted Logic Puzzles 101 and 102

I need some help. I'm registered for two courses at the Louisiana Institute of Epistemology this semester, but the TA's are super hard to communicate with! Can you help figure out where my classes ...
-3
votes
2answers
613 views

3 guards, 3 objects, 3 monsters and 3 questions

You are standing before 3 objects. You need to give the right one to the right monster or else you'll die. There are 3 people in front of you for you to question. One always lies, one always tells ...
13
votes
4answers
2k views

Incoming enemy! Scout, dispatch! [duplicate]

You are the leader in a group of 9 scouts. There are rumors of an incoming enemy army and your unit was sent to investigate where they are coming from. You are aware that there are only 4 ...
15
votes
5answers
3k views

Who led the mutiny?

You are were might still be a sea captain. On the 14th of December, 1214, your sailors rebelled. 6 sailors and your first mate get in a boat to row you to what they believe is an abandoned island. ...
26
votes
5answers
5k views

You trolls, get out of my party!

You have invited $2017$ of your acquaintances to a party. But after they all arrive, you come to know from a reliable source that each of your guests is either a troll or a true friend. You don't know ...
28
votes
13answers
93k 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 ...
2
votes
3answers
716 views

How to find the treasure?

You are standing in a Heptagonal room (has seven sides). Each side of the heptagon has a closed door, totaling four white doors and three black doors. In front of each door is a guard. Four of the ...
20
votes
5answers
2k views

Knights and knaves in Landilandia

You're traveling on a hiking trip in the land of Landilandia when you encounter a forest. The notes in your guidebook tell you that there's a safe route here leading into the woods, but when you ...
22
votes
3answers
2k views

The last question to the guards

"What will happen next?" asked the old man. His voice was friendly, his eyes bright, as always. His hair and beard seemed to be even whiter than ever before. "The standard procedure is as follows: ...
6
votes
1answer
660 views

Identify truth-teller amongst tricksters

There are 27 people. At least half of them are truth-tellers, others are tricksters. Tricksters can answer yes/no regardless of your question. But we should ask them such questions that truth-tellers ...
4
votes
2answers
616 views

The Rapper's Crown?

You are running through a mysterious dungeon, when you see a large room, which you enter. Inside there is a man and a woman, one is a truth teller, and one a liar. However when they write they always ...
5
votes
3answers
314 views

Sixteen Castaways

Note: This was reposted from Knossos Games. I am not affiliated with the site in any way, shape, or form. Marooned on a tropical island. Forced to send one fellow member of their ...
5
votes
5answers
2k views

Catch the liar(s). Prove it using a truth table

Alice: "If Bob is lying, Charlie is lying!" Bob: "If Charlie is lying, Alice is lying!" Charlie: "If Alice is lying, Bob is lying!" Who is/are lying? How do you prove it using a truth table?
7
votes
3answers
909 views

Trolls pretending to be Knights and Knaves

There are two Trolls, and each makes a statement. Troll 1 says "if we are cousins, then we are both knaves." Troll 2 says "we are cousins, or we are both knaves." Could both of the trolls be ...
4
votes
3answers
774 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 ...
3
votes
6answers
2k views

Knights, Knaves and Normals - the tough one

I found this puzzle and I have difficulties to solve it: Imagine three people, Alice, Bob, Chris, each of whom is either a knight, a knave or a normal. Exactly one person in the group is a knight. ...
18
votes
3answers
3k views

Knights and jokers

There are $N$ men. $K$ of them are knights, $M$ of them are jokers. $N$ is known, $K$ and $M$ are unknown. You know that: $K + M = N$, $K \gt M$, $M \ge 1$, $N$ is odd. Knights always tell ...
9
votes
6answers
3k views

Who stole the jewels?

Maybe you guys can help me with a puzzle. Only one of the following is telling the truth. Who stole the jewels? Frank: Marcus didn't steal the jewels. Marcus: Leon didn't steal the jewels. ...
25
votes
4answers
8k 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 ...
3
votes
2answers
2k views

Knights and Knaves Propositional Logic

I have a question regarding Knights and Knaves and logical proposition. If I want to solve the puzzle and I assume I have two kinds of citizens: Knights, who always tell the truth, and knaves, who ...
16
votes
1answer
592 views

Find the number from 10 statements

You are given the following ten statements and are asked to determine a particular number. At least one of statements 7 and 8 is true. This either is the first true or the first false ...
33
votes
23answers
5k views

Unfortunately, you died [closed]

Your soul is on its way to the afterlife when suddenly you arrive in a room. You look around and notice six humanoids staring at you. You walk toward them and you can suddenly hear them talk between ...
8
votes
4answers
1k views

Trick or Treating in Trutham-And-Ly

An entry in the 19th fortnightly challenge... Trutham-And-Ly, you may remember, is a small town in the north of Logistan. It is divided into two districts, Trutham and Ly, separated by a small stream....
0
votes
3answers
199 views

Confusing puzzle

So recently I came up with this puzzle/riddle that's really confusing me. So four people/Jokers are sitting at a table. Sometimes they tell the truth, sometimes they lie. My question is, which ...
-4
votes
3answers
152 views

Bias and the Liar [closed]

A cylindrical glass has water half its height Some say it's half full, while some say it's half empty But if Clair the liar mostly tell what's not right Will she say "it is full" or she'll say "it ...
15
votes
9answers
3k views

Find the correct door!

This is my first puzzle but I hope it will work out well and that everyone can enjoy it. While trying to get out of a dungeon, you arrive in a circular room with 5 doors at equal distances from each ...
-1
votes
5answers
491 views

The People Of Trutham-And-Ly

Here's an interesting variation on the classical liar puzzles: Trutham-and-Ly is a small town in the north of Logistan. It is divided into two districts, Trutham and Ly, separated by a small stream. ...
14
votes
5answers
2k views

Testing a new liar type

I haven't seen this kind of liar type before, so here is a simple puzzle as a means for a trial run. In particular, I did check it myself, but with new mechanics it's easy to miss something (I hope I ...
4
votes
1answer
297 views

What is the right answer for this question, with 4 different conditions

I'm confused; what are the right answers for the following question under each of the 4 different conditions listed below? “Are you Lala, or lying today, but not both?” If you are Lala, and you ...
5
votes
5answers
517 views

Identify who is who between 3 persons who tell the truth and lie alternately

Dipsy tells the truth in 1 day and lies in the next day alternately. If today he tell the truth, tomorrow he will lying, 2 days later he will tell the truth, and so on. Lala tells the truth in 2 ...
9
votes
3answers
593 views

Council of Magic, 5 years later - more spellcasters, more deception

Council of Magic - 5 Years Later: Five years ago, you managed to gain the support of the Council of Magic. However, now the King of Puzzlington needs their aid once again. As it worked last time, he ...
3
votes
3answers
192 views

Honeycomb structure statements (T/F)

2 1 1 3 0 2 1 Above honeycomb structure contains numbers. A number at each cell represent a statement. x : This cell is surrounded by x True statements. ...
6
votes
4answers
1k views

5x5 statement table

Statement table. 3 2 1 4 1 2 3 3 3 3 3 4 6 4 4 2 3 4 4 3 1 1 2 4 3 Above 5x5 table contains numbers. A number at each cell represent a statement. x : This ...
-3
votes
9answers
619 views

5 guards, 5 doors, and probability

1st Guard: Always lies all the time. 2nd Guard: Always tells the truth all the time. 3rd Guard: 75% probability of telling the truth. 4th Guard: 50% probability of telling the truth. 5th Guard: 25%...
7
votes
3answers
4k views

Determine which statements are True, and which statements are False

Determine which statements are True, and which statements are False There are 3 consecutive False statements This is The First True Statement There are equal numbers of True and False ...
5
votes
1answer
331 views

Three truth teller boys on an island

Each inhabitant of an island are either a truth teller who always speaks the truth, or a liar, who always speaks falsely. Three boys P, Q and R who live in that island, are each either a truth ...
-9
votes
1answer
204 views

A guy once said he lies. I still think what he really does [closed]

If a guy says "I'm a liar", what could we deduce from it? Is he a liar or not? let us say he isn't a liar, then his statement that he's a liar affirms that he is a liar. Let us say he is a liar ...
9
votes
3answers
640 views

Thirteen people telling truths or lies

A: There are exactly 5 people telling truths, while others are telling lies. B: F tells lie. C: E tells lie. D: G tells lie. E: If D is telling truth, B is too. F: If E is telling lie, C is too. G: If ...
9
votes
4answers
2k views

I do not speak lies

A person was travelling in the middle of an empty road. As he walked, he saw five doors, with guards in front of each one. He had no other way of crossing the road. The first guard said, "If all ...
25
votes
10answers
4k views

Liar and the Truth teller with 6 inhabitants

There are two types of people on an island: truth tellers and liars. Truth tellers always tell the truth, while liars always lie. A foreigner meets six of the inhabitants, and asks each of them the ...
27
votes
5answers
1k views

Council of Magic - a palace of deceptive spellcasters

Council of Magic: The King of Puzzlington has sent you to a distant palace to gain the aid of the Council of Magic. As your luck would have it though, spellcasters are a tricky sort. There are 4 ...
5
votes
4answers
3k views

How many of them are lying?

Here is a puzzle I am struggling to solve: Seven people are in an argument, but potentially some or all of them are liars. They give the following statements: Bob: "No one lies." Jennifer: ...
8
votes
2answers
720 views

Knight, Knave, Magician

In your quest to escape a Magician's lair, you are greeted by 3 identical looking gatekeepers. You can only proceed after correctly identifying which one is which. The only trouble is, they can ...