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461
votes
2answers
53k views

A short, brutal riddle

Left alone, I'm a word with five letters. I'm honest and fair, I'll admit. Rearranged, I'm of no use to trains. Again, and I'm an overt place, warm and well lit. What am I?
386
votes
4answers
30k views

This is important. I need you to listen…

Look, you don't know me. We've never met. But, like I said, I need you to listen... I had the most disturbing dream the other night... Woke up in a cold sweat and couldn't get back to sleep. It wasn'...
243
votes
1answer
9k views

A puzzle in 140 characters

Your final answer will respond to the question "Why don't I like Twitter that much?" Like usual, I'll confirm any sub-answers if you find them Here's the link to the puzzle on Twitter. Here's the ...
241
votes
1answer
25k views

Is this Tetris puzzle solvable?

As a birthday present last year, I received some fridge magnets. They didn't come as a puzzle, so I don't know if they have a solution, but I made a puzzle out of them anyway. The magnets are ...
234
votes
6answers
18k views

You have prepared. You are determined. You approach the door

Hints:
201
votes
1answer
11k views

An overheard gang meeting, a double agent, and a murder

I was walking home late last night and heard raised voices coming from a boarded up old warehouse. I stopped, out of sight, to listen... [When I started eavesdropping, the conversation was already ...
191
votes
7answers
20k views

My prefix is food, my suffix is rude

I thought of this riddle myself. Feedback is appreciated. My prefix is food. My suffix is rude. My infix comes in rounds. I keep you off the ground. What am I?
179
votes
1answer
25k views

Lock your computer when you walk away!

Well this is strange. I forgot to lock my monitor when I walked away from my desk, at work, and one of my co-workers decided to have a little fun. When I got back, I found this little C# console ...
177
votes
10answers
19k views

Game of Life: Kill the Sun

Below is an initial state for Conway's Game of Life with a single pulsar. Living cells are white. The area marked with red is your base. You are free to modify any of the red cells, but only those, ...
165
votes
22answers
73k views

In the 100 blue eyes problem - why is the oracle necessary?

The riddle Randall Munroe (of xkcd fame) has, a bit hidden on his site, a logic puzzle: A group of people with assorted eye colors live on an island. They are all perfect logicians -- if a ...
159
votes
1answer
12k views

Internship Available!* - Figure out what you're being asked to do before you sign up

Sine waves bound in rectangles shaped into prisms. Mass increases, position changes twice, and mass decreases. The prisms become rectangles and are either discarded or stored for later use. If that ...
152
votes
1answer
8k views

Merlin and Hermes: Mysterious Lines

Two adventurers, Merlin and Hermes, approached a large iron door built into a cliff face."Well...", said Hermes, "What do we do now?". Merlin produced an old, large piece of crumpled paper from his ...
151
votes
1answer
7k views

Chaos and Order: a visual puzzle in stained glass

I created a visual puzzle, which my wife then implemented as part of a stained-glass window. I've no idea if it is (a) obvious, (b) stupid or hopefully (c) extremely clever, and hence would love to ...
149
votes
1answer
4k views

The Rube Wordberg Machine

Gah! I used to be the brilliant one at Verba Retorta University, but ever since that damned Professor Wordberg showed up, there's been nothing but trouble. And it's all his confounded machine's fault! ...
140
votes
12answers
20k views

A double-agent with a conundrum

You are a double-agent in the most important war of the 20th century, The Falklands war. For years you have been playing the United Kingdom and Argentinian governments against each other, taking ...
133
votes
2answers
8k views

A mysterious email from Andrew Void

You are a secret agent in the service of the KGB, about to embark on a highly dangerous mission to infiltrate MI6. You have your disguise, your papers, and your backstory all prepared. The night ...
132
votes
3answers
5k views

Deusovi Honeypot

Looks like the community has spoken. With a heavy heart (as if), I have trapped @Deusovi behind a never repeating, fractally recursive, infinite, unsolvable labyrinth. To keep him busy, I added a ...
132
votes
4answers
7k views

Find the letters that complete these five patterns

Complete the last line in each of the following five series: Puzzle 1: "Using" is E "Desist" is I "Visits" is E "Design" is ??? Puzzle 2: ...
131
votes
13answers
20k views

This is it. This is the one. Find your wife

If you have found her, maybe you could try saving her? You come home one day and find your wife is out. You open your computer and discover an email from her. To xxxxx, / Curiosity killed the ...
127
votes
8answers
32k views

How can 64 = 65?

Here is a interesting picture with two arrangements of four shapes. How can they make a different area with the same shapes?
127
votes
2answers
6k views

Hearken, now, and listen close!

Hearken, now, and listen close; I have so much to tell. Now lend an ear and do your job; you surely will excel. To find my hidden message, gaze on every word herein. While skimming through it ...
120
votes
8answers
20k views

The Sheikh dies

The Sheikh dies, leaving behind three sons, 17 camels and the following order: His oldest son shall inherit one in two camels. His middle son shall inherit one in three camels. His youngest son shall ...
116
votes
7answers
41k views

Mensa IQ test question

Which of the 8 tiles below is missing? I've been trying to figure out the answer to this question for quite some time. Can anyone spot the pattern?
115
votes
9answers
18k views

Paying the Troll toll

You are on your way to visit your Grandma, who lives at the end of the valley. It's her birthday, and you want to give her the cakes you've made. Between your house and her house, you have to cross 7 ...
110
votes
6answers
24k views

100 Prisoners' Names in Boxes

Names in Boxes The names of 100 prisoners are placed in 100 wooden boxes, one name to a box, and the boxes are lined up on a table in a room. One by one, the prisoners are led into the room;...
107
votes
13answers
13k views

If you only have half of me, then I am of no use

People think a part of me is sticky, but I'm not. I do have a sticky friend though. I can create almost anything, but I'm not very creative. After I have done my thing, you can't tell ...
105
votes
2answers
12k views

Which country is INDIA in?

An intrepid globetrotter needs to know this: BENIN is in Libya CANADA is in China DENMARK is in the United States FRANCE is in Germany INDIA is in ??
104
votes
1answer
7k views

How can this shape perfectly cover a cube?

The following shape: can be folded onto the surface of a cube in a way that perfectly covers the entire cube with no gaps and no overlaps. How can this be done?
104
votes
1answer
3k views

Paper Picture Puzzle

Here is a puzzle I drew Your final answer will be what you need to know to solve this puzzle (You'll know it when you have the final answer) Notes: I did a couple dumbs. One is the space planning. ...
103
votes
1answer
5k views

A Missing Symbol for This Logo

What symbol should I put in the center to complete this logo?
102
votes
15answers
37k views

My wife has died

In 1980, a man lives on the 30th floor of his building. Every morning he wakes up, gets ready, kisses his wife, takes the elevator down to the first floor, and goes to work. One morning, he wakes ...
102
votes
3answers
7k views

The brain-curdling eldritch horrors and the third dimension

We're in the year 2016 so it's finally time to take puzzles to the 3rd dimension! So let's see what those beautiful times bring us today: (click to enlarge) Everyone of you clever sods could as ...
98
votes
9answers
13k views

A hunt for long forgotten treasure …but beware the pirate's curse!

I never really knew my uncle growing up. He seemed nice enough, but I got the sense from the distant, troubled look in his eyes that there was at least some truth to the rumours... Years before I was ...
98
votes
1answer
5k views

This party ends in tragedy (I planned it from the start, you see)

The DJ from Moscow was pumping out tunes. The house mostly bare but for furniture, strewn; A sofa for three and an armchair for one. The guests started piling in, looking for fun... 'Twas ...
95
votes
5answers
14k views

Mate in 0 moves

Not exactly a traditional chess puzzle, and I won't offer much of an explanation for fear of giving away the answer. White must mate in 0 moves, meaning he must deliver a check mate without touching ...
94
votes
8answers
6k views

Make all the statements true

Can you make all the below statements true with a single click? If yes, explain how. Three + Eleven = Ten Seven + Five = Six Two + Four = Eight NB: Single click means, with only a single left mouse ...
92
votes
9answers
16k views

Five coloured doors, which leads to freedom?

You have been incarcerated in a high-security prison for several nefarious crimes which we need not go into here. The warden, being a kindly logician, offers you a single chance to escape. You are ...
90
votes
15answers
909k 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 ...
90
votes
2answers
37k views

3 Logicians Walk Into a Bar

Three logicians walk into a bar. The barman says, 'Does everybody want a drink?' The first logician says, 'I don't know.' The second logician says, 'I don't know.' What does the third logician say? ...
89
votes
6answers
9k views

Fwd: Re: Karen is missing!

From: Ada Hughes <ahughes@fib.gov> Sent: Thursday, April 7, 2016 7:03 PM To: Joe Dorsen <jdorsen@fib.gov> CC: Jason Bernz <jbernz@fib.gov>; IT Guys <cis@fib.gov> Subject: Re: ...
87
votes
3answers
9k views

Do I Work with an Orangutan?

This morning I found myself face-down in front of a large building. It was obvious that I had taken a great fall from one of the rooms above me, but now I apparently had amnesia. I went in. I could ...
86
votes
9answers
32k views

I am a computer’s nightmare, but a programmer’s best friend

I am a computer’s nightmare, but a programmer’s best friend. I am both the cause of a problem and the source of its resolution. What am I?
86
votes
4answers
14k views

It's my birthday today - how old am I turning?

It is my birthday today Last year I had 5 candles 4 were lit the last was not But today, I'll light them all How old am I turning today? HINT: I am not turning 5 today and...
85
votes
4answers
5k views

Checkmate in 1 on a Tangled Board

Lots of pieces are tangled here. Can you find mate in one? Small hint to guide you in the right way:
85
votes
1answer
5k views

A strange hotel

Entering the lobby, I requested a room. The clerk handed me my key and I took the elevator to my floor. To my surprise there was a sign on the door of my room telling me I should try a different room ...
84
votes
25answers
22k views

How do you prove that mirrors aren't parallel universes?

Migrated from WorldBuilding SE $:)$ "Each mirror is a world of it's own," Joe explains. "Joe, that's bulls***! Mirrors are just mirrors!" Rita proclaims. Joe proceeds to lay out the following~ $10~...
84
votes
10answers
24k views

Guard gets fired after saving CEO's life [closed]

A classic: A CEO of a multi-million dollar business has to go on a business trip to Belgium (from somewhere in America). Before going to the airport in the morning with his limousine, he's going to ...
84
votes
7answers
16k views

Thanks, dad! Never again

No idea why my dad dragged me into this place. Some guy is performing on the stage. He's reading numbers out loud. I think it's some kind of a sequence puzzle. 1... 8... 9... 16... 17... ...
83
votes
7answers
18k views

Why does this solution guarantee that the prince knocks on the right door to find the princess?

I found this puzzle online: On the top floor of a castle lives a princess. The floor has 17 bedrooms arranged in a row. Each bedroom has doors connecting to the adjoining bedrooms as well as to the ...
82
votes
2answers
3k views

REJBÄS - an unfinished flat-pack puzzle

I'm going to come right out and say it: I'm kinda bored of making puzzles, but I still want those sweet, sweet imaginary internet points, so I'm phoning it in this time with a flat-pack rebus I bought ...

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