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2
votes
2answers
327 views

The Broken Device

Your old friend from college is visiting and brings back this weird electronic machine with him. He says that it's supposed to take input and spit out a number, but some prank was pulled on him (he ...
9
votes
3answers
597 views

Variations on a Theme

Instructions The game is to fill in the blank with a word or few - no more than three. No tricksy nonsense. No hidden meanings. No "lateral thinking". In fact, only vertical, parallel, dorsal, ...
12
votes
3answers
2k views

The horrible wordsearch: Can you decypher the word-search puzzle to find the final clue?

This will be a tricky one, I think. The whole puzzle is self-contained in the information between the two horizontal bars below. The answer to this riddle is a book title of 5 words. The book is ...
30
votes
2answers
3k views

Determine the algorithm

So I was given this puzzle quite some time ago and just thought it would make a nice addition to this site: Your task is to determine the method how the result is determined from the given number. A ...
9
votes
1answer
413 views

Generalisation of tours on chessboards

It's well-known that a knight placed on one square of a chessboard can get to any other square, but a bishop can only reach half the squares from a fixed starting point. Another question on this site ...
-4
votes
1answer
549 views

What could the only answer to this question be? [closed]

You're not allowed to restate the question, or answer with a question. What could the answer be?
4
votes
1answer
665 views

Riddle - who am I to gather such renown?

I might be a city in one of the 'stans. I might be a river or more in Australia. I might have once bifurcated cleanly. I might have colleges named after me. I might be said to be covered in blood. ...
7
votes
2answers
1k views

Four people in a dark lift

This is an old puzzle and won't take long to be solved, but I think it's a useful addition to the site. In a hotel in France at the time of the German occupation, two men and two women are in a ...
35
votes
1answer
3k views

Lolcat Steganography: Find the message hidden within the transport medium of humorous feline photography

The Bad Guys (curse them!) have begun communicating in lolcats, to enable their Internet communications to take place unnoticed. This is a job for the NSA/GCHQ crack team of cryptanalysts. ...
1
vote
7answers
2k views

Which square doesn't belong here and why?

Which square doesn't belong here and why?
12
votes
1answer
679 views

The hidden order not to be ignored

Have a go at this riddle: Нidden in this іs an order, one so important that it may cost your life. Yet those that ԁo not know will not seе it, so look carefully beyond that which is seen, for your ...
11
votes
3answers
2k views

Simple twisting riddle

One of the riddles we used to have painted on the walls of one of our classrooms in secondary school (with the last part added in :+ ): What runs but doesn't walk, has a mouth yet still can't ...
18
votes
1answer
2k views

The untimely death of Dr. Wenzel: What give-away clue is hidden in the crime scene image?

Dr. George Wenzel and his colleague Dr. Martin Hupp are two expert biochemists researching brain-wave-changing drugs. Their work has long been regarded as being worthy of the Nobel Prize, in ...
5
votes
4answers
1k views

Name that Sandwich (2)

The epitome of an evil the skewed letter would label To many is such truth, not a fable Held tightly by urges of the seconds Within the sleepless cities that beckons Twice I hold the path of tea ...
1
vote
2answers
1k views

The answer lies within this question!

I lie inside this question, and I hide behind a mask. I don't think you'll see me from my appearance. I hope you conclude where I'm too, but I doubt you will without clever thinking. What am I?
-3
votes
6answers
85k views

When does 1+1=3? [closed]

When does one plus one equal three?
-3
votes
6answers
548 views

The Russian Birth Dilemma! [closed]

How is it possible that a person born in Russia, with parents that were indeed born in Russia, is not born as a Russian citizen? Tip: This riddle is a little tricky, but when you think about it ...
10
votes
1answer
870 views

An international affair: Find the common property in incorrect equations

Chaos at the international conference for world leaders: What should have been a peaceful exchange of ideas for common growth quickly exploded into hostility shortly after the German speaker addressed ...
0
votes
2answers
758 views

Feel the Enlightenment!

Another riddle coming to you from the land of poets and thinkers! Focus on word building this time. Well, as you might have thought...it's easy. I decide if sweet or stinky For most locks I'm the ...
7
votes
1answer
1k views

Oh no! Yet another number series… - Find the pattern in the two examples and provide an extension

Because these have been so successful in the past, I had to bring up my own. In fact, this puzzle was inspired by Find the next number even though I (and I guess everybody but the author) still don't ...
10
votes
2answers
3k views

Riddle without a twist (this riddle may/may not kill you!)

This is a riddle without a twist. A straight forward one. Not almost, but all the lines will point you in the right direction. The puzzle is really really easy. I am sure someone is going to post the ...
6
votes
1answer
668 views

Find out which instruction is wrong

The object of the following flow-chart is to rearrange the numbers in boxes 1, 2 and 3 in such a fashion that, at the end: ...
37
votes
5answers
12k views

Duel between the knight and the dragon

A dragon and a knight live on an island where the only sources of fresh water are a pond (containing ordinary water) and six wells, numbered 1 to 6. Each well's water is completely indistinguishable ...
12
votes
2answers
4k views

Riddle with a twist

This is a riddle with a twist. Almost all the lines will point you in the right direction, but hidden somewhere in the riddle is a red herring. If you find the right solution, I'll accept your answer, ...
23
votes
4answers
7k views

Beware - this riddle might kill you!

The answer to this riddle is a single word. It should be slightly harder than my simultaneously posted Riddle with a twist, but still fairly easy. From the middle of the sun through all the rain, ...
3
votes
4answers
1k views

Sell the fuel and become a Millionaire [duplicate]

You are living in the 22nd century. The fuel prices are unimaginably high and it is very rare to get, so the Government has introduced some new laws to control fuel smuggling. Rule 1: One cannot ...
-2
votes
1answer
397 views

The 'number of months' challenge [closed]

Okay, here I am having a puzzle for you all. The puzzle is quite short and clear in it's own way I am telling you. Rather than a question it's more like a challenge to you all (answer is already known)...
2
votes
2answers
231 views

The hour glasses! [duplicate]

You have two hour glasses: A seven minute one and an 11 minute one. Using just these two hour glasses, accurately time 15 minutes.
34
votes
3answers
2k views

Find the missing elephants

Determine color and direction of the missing elephants in the picture. Here's a textual representation of the above. ...
-9
votes
2answers
793 views

Code Uncrackable!

You can't crack it. There's a solution, definitely. It's pretty long. 0005200056 0005200057 0005200056 0005200057 0005200056 0005200057 0005200056 0005200056 0005200056 0005200057 0005200056 ...
10
votes
1answer
567 views

Physical puzzle in four parts

This is simple and has a glaringly clear solution. Instructions: Print Cut Assemble To make it a proper puzzle and avoid half-solutions: The solution I'm looking for has all pieces ...
8
votes
1answer
1k views

Crack this code: AYVEKCI0

I devised this cipher independently, but I have no idea whether it's easy or hard because I have little knowledge of cryptography. The algorithm is simple but not trivial. ...
29
votes
1answer
2k views

Continue the Pattern of Circles

The following shapes are sequenced from left to right. Describe or create the next five shapes. Bonus points to those who describe how the pattern works. The pattern could continue on forever. The ...
11
votes
10answers
5k views

The treasure hunt

An archaeologist who has just unearthed a long-sought-after pair of ancient treasure chests. One chest is plated with silver and the other is plated with gold. According to the legend one of the ...
2
votes
1answer
1k views

What is the next colour?

What would be the next colour in the sequence. The correct answer will also state the logic behind it.
20
votes
4answers
5k views

Hidden in plain sight - By what method do these images hide a prime number?

Note: This question has been severely edited from its original version to better fit the format of this site. Some answers below - including the accepted, correct answer - have been given based on the ...
7
votes
2answers
2k views

Irreversible body swap

In Futurama's episode 6x10, the professor invents a device which allows to switch mind between two bodies. He then switches his mind with Amy. It later turns out that the a given pair of bodies can ...
2
votes
1answer
834 views

What is the longest word made from Chemical Symbols without repeats? [duplicate]

I guess as an addendum to The Longest Word Made from Chemical Symbols What is the longest word in the ENGLISH language that can be formed by combining chemical symbols and has no repeat elements in ...
-1
votes
1answer
464 views

Can you crack the code?

I GMMA OBBK GKONYQ TC WWA ZTS KCSD SM PKGPX. GEST MBG ROC BOK KMUUU FDU IAONXJJ, JWS EQDD RA LGXC. EWU IS GP JJN TK VQHM NE TD BMLSX. KRQE LTAH! Hint (if you want ...
7
votes
1answer
363 views

Wine with dinner

On a certain road there are 32 houses in a row, numbered 1 through 32, each inhabited by a single person. During the month of January each house is hosting a dinner date. House 1 on January 1, house ...
2
votes
3answers
639 views

Conversation with a cop - please explain

I've heard the following second half of a story: A policeman got out of the car and saw the boy. He walked up to him and said amiably, "What's your name?" "Shut up!" the boy replied. "...
-1
votes
2answers
371 views

Computer Crisis Takeover! [Part 3]

This is part 3 of a series of multiple parts about a takeover of all the computers on earth. The links to previous questions are here: Computer Crisis Takeover! [Part 1] Computer Crisis Takeover! [...
8
votes
1answer
2k views

Can you pass through the ancient tomb? Find the correct interpretation for the symbols

You have been crossing this hot and wet place for weeks now, but when you enter the cool and mouldy ruin, you know in seconds it has been worth it. Nobody has ever been here ( - well nobody in last ...
6
votes
4answers
610 views

The Longest Word Made from Specific Chemical Symbols

So, my first question on this topic was answered fairly quickly with quite a long word, so I thought I might post a different version of the puzzle The idea this time is similar to last time: you ...
5
votes
2answers
658 views

The Brother to Bones - Name the brother of the man-ape and the caprivore

The Man-ape's whose fur and name change in the cold. The caprivore with piercing teeth threefold. My adopted kin, for my only true brothers are gone. They melted to black before history's dawn. ...
15
votes
3answers
5k views

Crack the code and become happy

Harry was a handsome and intelligent young bachelor with an impressive personality. One day he went to a leading IT firm for an interview. As he entered the room, he got stunned by seeing the beauty ...
10
votes
2answers
6k views

gegs? (9, 4) - a british cryptic crossword clue

Hope this is a suitable forum for this puzzling question (its also a bit old now so may be answered in seconds...) as its my first post and I'm trying something new. Minor hint: this is a cryptic ...
-1
votes
1answer
182 views

Crack the code: L0EJAU [closed]

I have a code for you: L0EJAU Amazon's biggest rival was the one who made this. What is this?
2
votes
3answers
621 views

A Puzzle for Rio

The following list contains 30 clues describing 30 unique English words or well-known names, all of which have one thing in common. The objective of the puzzle is to find the words associated with ...
10
votes
5answers
1k views

Ernie and the Mystery of Madame Mu

Quite a few years ago (I can't remember the date but it was obviously some time after I first met Ernie at a New Years Eve party in 2001) I got an unexpected phone call late one afternoon. It was ...

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