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).
225
questions
1
vote
1answer
173 views
What is the smallest number of lies needed to solve a Dragon Joust puzzle?
I recently watched this video which presents a deduction "riddle" about dragon jousting. The rules for the puzzle (from the video) are as follows:
After centuries of war, the world’s kingdoms have ...
3
votes
8answers
480 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
(...
7
votes
1answer
242 views
The scales never lie (oh yes they do!)
There are $10$ coins, one of which is a fake, and weighs either more or less than the others - you don't know which.
There are two sets of scales - one tells the truth, the other lies (always says ...
13
votes
8answers
4k views
2 Guards, 3 Keys, 2 Locks
There are 2 guards: one only tells the truth, the other only lies.
There are 2 locks and 3 keys: each lock can only have 1 key matched - the 3rd key doesn't do anything.
You can only ask one ...
4
votes
2answers
204 views
Knights and knaves puzzler
A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie.
You meet three inhabitants: Peggy, Joe and Zippy.
Peggy claims, "I am a knight or ...
3
votes
2answers
95 views
Knight and knaves
A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie. You meet three inhabitants: Alice, Rex and Bob, where
Alice tells you that "Rex is ...
7
votes
4answers
409 views
Island of Knights, Knaves, Spies
There are 3 types of inhabitants of a village: knight, knaves, normal. You should map each inhabitant with its type, by asking only this type of question to a person:
"Hey X, what is the type of ...
1
vote
0answers
57 views
Survive from death by asking the right question twist [duplicate]
You are at a path and there is two roads splitting from it. The first one is certain death and the other is the way home. You do not know which way is the right way home, but there are two people. ...
36
votes
10answers
5k views
Knights and Knaves: What does C say?
You are on a fictional island with two types of people: knights who always tell the truth,
and knaves, who always lie. Three of the inhabitants - A, B, and C are standing in the
garden. A says, "B and ...
8
votes
12answers
3k views
Time to call the bluff [closed]
You are located outside of two rooms which have a door between them. Each room has one or more computers whose total power is unknown, so they cannot be reliably used as proof-of-work to compare times,...
6
votes
18answers
4k views
Ask one verbal question to figure out who is blind and who is mute among three persons
This is another "You can ask only one question" puzzle. This is an edited very restricted version
There may be multiple answers but I could come up with only one.
There are three persons in three ...
8
votes
2answers
253 views
Knights and Knaves on a (Not So) Deserted Island
One day, while flying your single-engine seaplane out over the Pacific, the electrical system shorts out, all of your electrical systems (including the radio) fail, and the engine dies. You are in a ...
2
votes
1answer
231 views
The chariot race
In a chariot race only 4 cars came to the finish: the blue, the green, the red and the white one.
Titus, who is in bed with a cold, inquires to Quintus about the outcome of the race, because he ...
12
votes
4answers
4k views
The joke office
Alice and Bob are supposed to get form A at the joke office.
Forms A, B, C, D and E are each at exactly one of the following five terminals. At one Terminal is only one form.
Terminal 1:
Here ...
14
votes
2answers
745 views
The alcoholic village festival
The villages Arriba and Abajo together have 2019 inhabitants.
At the annual festival are
more than 2000 villagers this year.
When they form a huge circle for dancing, everyone calls
happy: ...
21
votes
8answers
3k views
Robots in a spaceship
Xerxes has 6, 7 and 8-arm robots in his spaceship. Unfortunately, the 7-arm robots are misprogrammed and everything they say is a lie. The other robots are fine, they always speak the truth.
Once ...
6
votes
4answers
572 views
Simple logic puzzle
We think of an island inhabited by rogues and knights.
Rogues are always lying,
knights always speak the truth.
One day 12 islanders come together
among which is at least one knight and at ...
15
votes
3answers
2k views
The warming up game
The theater group began today with a warming up game.
Everyone has been assigned a role and is now either a bad guy who always lies, or a good guy who always tells the truth.
Max, who comes late, ...
9
votes
2answers
634 views
Six liars, truth-tellers and jokers
As in this puzzle, there are three different kinds of people: truth-tellers (always telling the truth), liars (always lying) and jokers (who may either tell the truth or lie).
Based on these aspects ...
6
votes
2answers
285 views
Liars, truth-tellers and jokers
In a strange village there are three kinds of persons: knights (always telling the truth), knaves (always lying) and jokers (who may either tell the truth or lie).
A, B, C and D live in this village, ...
7
votes
3answers
625 views
Three knights or knaves, three different hair colors
In a group of three people (A, B and C), everyone has a different hair color (blond, black or brown, not necessarily in this order) and everyone may be either a knight (always telling the truth) or a ...
4
votes
1answer
254 views
Four Doors, One Escape
You are trapped in a room with four adjacent doors upon a wall. On each door is one of the first letters of the alphabet, in order, from left to right. You know that one of the doors leads to freedom, ...
4
votes
1answer
377 views
Lying under arrest
I'm in a custody, under arrest, no contact with the outside world.
I do not know if in that jurisdiction authorities are allowed to lie.
Some real-world knowledge suggest lying by authorities is ...
3
votes
2answers
147 views
The truth within
Someone living in the remote cabin that you do put a virus onto your PC.
Here are your suspects:
Your brother, Liam, who only tells the truth about his opinions.
Your sister, Irene, who tells the ...
19
votes
5answers
1k views
Island of Knights, Knaves and Spies
There is an island with $N$ inhabitants (for example $A_1, A_2, \dots, A_N$), each of them is either a knight, a knave, or a spy. As usual:
knights will always tell the truth upon answering a ...
3
votes
5answers
381 views
A story about liars
Evelyn, Skylar, Alayna, Madelyn, Jonathon, Lara, Alyin, Felix, Iris, Bob and Roslina live on an island where some people always tell the truth, and the rest always lie.
Roslina says "Alyin and Evelyn ...
43
votes
11answers
8k views
3 doors, three guards, one stone
You are in a room with three doors. Behind two of them, the darkest pit of hell waits for you to make a mistake. The other door leads to heaven and freedom.
Each door is guarded by a guard:
Michael, ...
10
votes
1answer
1k views
Island of Liars
A king goes to an island, where there are 5823 people who always tell the truth and 8723 who always lie.
The king is special guest for the party celebrating 2053 year.
On the party, liars and ...
1
vote
2answers
353 views
Brain twister. A simple riddle to play [duplicate]
You are lost big crowded (monster). There are only two human living Jacobe and Recode . Your task is to reach your home, there are two routes and you are confused.
Conditions: Jacobe always tell the ...
2
votes
2answers
80 views
Does it exist a way to solve visually by using a grid or to find the truth among a set of five people telling different statements?
I am having problems with trying to solve this riddle therefore I am looking for help. The situation is as follows:
At a semiconductor laboratory in Hsinchu a security guard caught five
...
-1
votes
2answers
112 views
who eats more fruits? [closed]
in a party 3 brothers discussing:
first brother says " I ate more fruit than 2nd brother and 2nd brother ate more fruit than 3rd brother"
2nd brother says " 3nd brother ate more than me also 3rd ...
6
votes
3answers
544 views
Monty's Labyrinth
(A fun combination of two classic puzzles, hope seasoned puzzlers enjoy.)
Having escaped through almost all of a labyrinth, you are met by three magical doors. Two of them lead to certain and ...
6
votes
1answer
1k views
Classic two guards and two doors
I recently heard a version of the classic two guards (one is a knight who always tells the truth and the other is a knave who always lies) standing by two doors (one leads to certain death and the ...
3
votes
4answers
601 views
The Three Mystery People- An Actual Mystery
I believe almost everyone has heard this riddle before.
There are three people in front of you. One always tells the truth, one always lies, and one answers randomly between truth and lies. You ...
4
votes
2answers
676 views
yes/no logic problem
There is a truth teller (always tells the truth), a liar (always lies), and one that sometimes answers truthfully and sometimes lies. Each person knows who is who. You may ask three yes or no ...
10
votes
1answer
731 views
Murder in the Royal Court
An entry in Fortnightly Topic Challenge #40: Retrograde Analysis!
I can't believe it! Last night we heard a bit of fighting... but we had no idea that... our King was in check, and my fellow Rook and ...
6
votes
1answer
244 views
Truth tellers or liars among two people
Two guys, number One and number Two. You ask number One "Is there a truth-teller among you?". He replies and you have the answer to your question. What is number One and what is number Two?
2
votes
3answers
300 views
Fami-liar Situation
Exactly one of Sam or Tom has family visiting. They make these statements:
Sam: "Tom has family visiting, but I don't."
Tom: "Sam is lying, or I am lying, or possibly we're both lying."
...
3
votes
4answers
352 views
Classic 2 Guards But With 3 Doors Instead
So the rules are almost the same :
You get to ask just one question to whichever guard you want to (just 1 guard; asking both guards is not allowed)
There are 2 guards, one tells the truth and ...
5
votes
1answer
141 views
A Tournament to Remember
The King:
Recently we had a big tournament, worth being immortalized in the chronicles of my kingdom. Unfortunately, the court scribe misplaced the record of the final event, and we need to restore it....
-4
votes
3answers
218 views
Riddle Again, Riddle Again, What am I? [closed]
1.
If a chicken says, "All chickens are liars" is the chicken telling the truth?
2.
A man is traveling to a town and comes to a fork in the road. If he goes left, he goes to the liars' village....
6
votes
4answers
338 views
A Space Station 13 malfunctioning A.I
Disclaimer: It is not necessary to read the previous puzzle, or the one before even if it continues on the same story. The current puzzle is a different one which can work as a pure standalone. ...
1
vote
1answer
382 views
Tell the truth Puzzle [duplicate]
There are three people (Ajay, Bhuvi and Chandu), one of them is a Gun, one a missile, and one a robot. The Gun always tells the truth, the missile always lies, and the robot can either lie or tell the ...
11
votes
3answers
753 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 ...
24
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 (...
4
votes
3answers
472 views
The Magical Prison Riddle
(I made up this riddle myself, hope you enjoy it)
A criminal was using magic to flatten a building, while everyone, except 2 people, ran away being super scared. The police of magic came, and with ...
1
vote
1answer
396 views
7 Prisoners Say
Prisoner 3 says: "Prisoner 5, Prisoner 6 and I are truthful".
Prisoner 6 says: "Prisoner 5 and Prisoner 1 are truthful".
Prisoner 4 says: "Prisoner 7 lies".
Prisoner 1 says: "...
8
votes
6answers
549 views
Eye exam for the truth-teller, liar and joker
A, B and C went for a eye exam together for their driver licenses. All 3 of them have bad eye sight and needed their own glasses to see clearly. However only 1 of them remembers to bring the glasses....
10
votes
3answers
2k views
Knights and liars
An island is inhabited by both Liars and Knights. Knight always tells the truth and Liar always lies. One day 12 islanders gathered together and issued a few statements. 2 of the islanders said "...
19
votes
4answers
2k 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, ...
