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8
votes
1answer
449 views

What is the meaning of a “tetrad twist” in Thistlethwaite's algorithm?

I am having difficulty understanding the third stage of Thistlethwaite's algorithm. I am using http://www.jaapsch.net/puzzles/thistle.htm. The third stage has a factor of [8!/(4!4!)]2 *2*3. This ...
12
votes
1answer
2k views

Multi-part challenge: riddles and cipher

This is a multi-part challenge; you will need stamina to complete it! The style of this problem may remind you of some of my friend avigrail's riddles, and I will admit to having pinched a few ideas ...
5
votes
2answers
637 views

What to do when the official Rubik's cube solving sequence breaks?

So, the official guide shows you exactly how to solve the white cross, first layer, etc. but on the second layer, assume you've completed every little square but one (and edge) and that there's 2 ...
4
votes
4answers
501 views

Question about 1 on 1 on 1

Warning: Most of my posts are riddles disguised as something else. For those who have enjoyed my contribution and are expecting more, DO NOT try to guess that the answer is a tugboat, geese, or the ...
17
votes
2answers
2k views

A riddle wrapped in a mystery inside an enigma

The following message can be unambiguously decoded to reveal an eleven letter word. It can be deciphered with pen and paper, although knowing a bit of Python would probably help. What is the word? ...
13
votes
2answers
1k views

Victorian Love Letter - The name has rubbed off. Who do you deliver it to?

A presence almost feline seems to follow wherever you go, such is your grace. The brilliance of thy concentrat'd beauty would pierce a steel aegis as sure as my heart, though through you the beauty of ...
5
votes
5answers
1k views

Headings had had their hints long long time ago

Hello everybody, can someone help me? This riddle really gave me the gilles so far. I need to solve this for school but I have no idea! joking ;) Not sure if it will help - check this out. So funny! ...
7
votes
1answer
2k views

Who committed the murder?

Inspector Rottman is investigating the murder of a young clergy assistant in the quiet village of Roeville. Having already done some detective work, he has the following three main suspects: ...
15
votes
7answers
7k views

I am precious to you, but kill me you do. … What is my name?

I am precious to you, but kill me you do. I am older than you, but still ever new. I cannot be sold, for money or gold. I can EVEN fly. Yet wings have not I. This is no ...
7
votes
2answers
343 views

Use intuition, It causes a schism. Entity?

In your mind I manifest Understanding of me is vague at best I'm said to take away the order Less likey to be seen in the daughter Heightened moods wont decide your fate When held onto, is my ...
9
votes
4answers
2k views

Riddle about small things

Hopefully this one will occupy you longer. ...
38
votes
1answer
4k views

So how did the date go?

It's Monday morning. Fernando just sat down at his desk for another hard day at work - programming stuff and answering telephone calls - "have you tried turning it off and on again?" As he is about ...
25
votes
2answers
2k views

Death cases of computer technician

Police found the body of a computer technician in front of his computer, with a belly wound. There was a possibility of the victim bleeding to death after being stabbed with a sharp object. There were ...
8
votes
2answers
440 views

Replacement Cipher

Replacement cipher: Let τ be a permutation of the alphabet, and apply τ to each letter of the message. Frequency analysis is useful for breaking this type of code. Decode the following, which was ...
-6
votes
4answers
501 views

The Norwegian Foreman

An American architect was in Norway for a business trip, and he was working with a Norwegian Foreman who was building a skyscraper. The Norwegian did not know how to say any numbers in English, but he ...
5
votes
2answers
445 views

Continue this number-triplet series

(4-6-4) (6-12-8) (8-12-6) (12-30-20) What is the next number triplet - and why? I'll add hints if nobody gets the answer first. In the past I've used this riddle in a game with my RPG gaming group. ...
7
votes
3answers
349 views

Serpina Pro Art Studio 1.89-1 Technical Update Manual - When is this software's new version released?

When was this graphics software released? Must include reasoning behind your answer! NOTE: As of this date, customers in Canada and the Us MUST USE TWO VERSIONS PRIOR - 1.63-1. Current version will ...
2
votes
3answers
340 views

Capture The Runaway Mouse

Say you have a grid of 16x16 squares. Label them A through P and 1 through 16. Now say that at H8 there's a mouse that moves at 1 slot every turn. Also, you get to block a tile every turn. Say the ...
18
votes
8answers
2k views

When should you rest?

You are in an airport and are worried about missing your flight. So you start to run the long distance to the flight gate at a steady speed of 10km/h (you have bags and are not very fit). ...
13
votes
6answers
1k views

The Hallway and Tele Doors

Assume you have an unlimited but finite number of linking, teleporting doors you can add to a hallway of finite length. Assuming there's a door at the start and finish, can you arrange the teleports ...
8
votes
4answers
4k views

Hungry, hungry _____

Be kind, this is my first time trying to make my own... When my owner is closed, I am open My owner never cleans me out Few can afford to keep me fed Because people always take my ...
2
votes
3answers
2k views

One to Nine Puzzle

I got those from a cereal box. You can use each number 1 to 9 only once. Operation should match the value in the green box horizonal and vertical My problem is Operation Order isnt specify in the ...
13
votes
3answers
1k views

A Lover Spurned - A broken heart cries, waiting for your love. Figure out their name so that you can engage in a little rebound romance

Is this about all the heroin? After everything? And this is how you repay me? I don't just mean keeping you clothed and respectable looking. I don't just mean saving your life. I thought we were close....
14
votes
2answers
2k views

The Sinister Killer

The body was lying naked on the floor of an apartment living room. Crime scene investigators and forensics were inspecting the body and the nearby area. You, detective Randy, opened the door and ...
33
votes
5answers
16k views

Oh, it is greater than God!

What is greater than God, worse than evil, The poor have it, the rich require it, And if you eat it, you die? What is it?
4
votes
2answers
1k views

The title of a song

The eleventh day of spring 26 The twelfth night of summer 74 The first night of autumn 80 The second day of winter 86 I have hidden 4 song titles in the sentences above. What are the song ...
36
votes
3answers
3k views

How do I write a “solid” Riddle?

This is about the objective interpretations/assessment/quantification of riddles. Let us define a riddle as a type of puzzle relying on the usage of only language and context. Using precise English ...
16
votes
2answers
1k views

Tic-Tac-Toe variant

To help people think this out, I've made a web game with increasingly difficult cpu players to allow brainstorming and testing strategies: cpu player, easiest (version 1 - at least 5-in-a-row is ...
1
vote
1answer
702 views

The key is also the solution: a word puzzle

The following text is encrypted with its own key. Ip;g siyyiu el ytaik pl ej ygi dit el auillik =eyg pb zaazleyi jebhiuC A hint for those that want it: Second hint: How did I encrypt this and ...
9
votes
4answers
935 views

Generalized Path Guards

Suppose you are traveling and come to a fork in the road. One of them leads to something good like a cat shelter and a company handing out free ice cream and money, while the other leads to something ...
-10
votes
2answers
544 views

The Three Coffins

Two mothers and two daughters were in a multi car accident. They were all pronounced dead at the scene. All the bodies have been moved to the local mortuary. There are only three coffins. No one is ...
-2
votes
1answer
355 views

Vigenere text cipher

Cipher: Udfwavk wcfo nt "zjljhydmu" This cipher is a solution to this which is currently unsolved and has a bounty. Clarifications: This is a special cipher, a Vigenere cipher, with this riddle ...
17
votes
17answers
13k views

If this were an answer, what would be the question?

Heading down to the city of Thebes, you encounter a Sphinx who stops you in your journey and speaks to you. The Sphinx has a riddle for you: if you can solve it, she will let you pass; if you fail, ...
-1
votes
3answers
216 views

8 queens equivalent on checkers [closed]

I'm a computer programmer trainer and sometimes I do some puzzle exercises with my students. Right now we did a checkers game and I would like to make them program to solve something with their ...
25
votes
5answers
1k views

Polyomino T hexomino and rectangle packing into rectangle

Let's pack some (one or more) T hexominoes together with some (one or more) small $a\times b$ rectangles into some bigger $m\times n$ rectangle without holes and overlapping pieces. For example, I ...
32
votes
11answers
3k views

Coin weighing with a single weighing device

You have 12 coins which each weigh either 20 grams or 10 grams. Each is labelled from 1 to 12 so you can tell the coins apart. You have one weighing device as well. At each turn you can put as many ...
8
votes
3answers
1k views

The antisocial chair problem

A room has n empty chairs in a row. You choose a chair and sit it in it. Now someone else comes in and sits as far away as possible from everyone in the room or an arbitrary choice of furthest chair ...
4
votes
2answers
944 views

The autobiography of ___________? - From the misprinted page of an article, uncover the name of the writer

You're sitting at home reading a magazine and you came across a cool article, but there's a misprint. Most of the page is blank. You can make out that it's someone plugging an autobiography from the ...
4
votes
3answers
1k views

Riddle - answer is a URL or picture

My cousins have a lump or two, But I have none. I'm coloured like a grassy hill; Never seen one. A war is fought within my bounds, Let's hope that peace will be found. I may sound like a pub on ...
6
votes
3answers
1k views

A face of a thousand masks

For every question you might ask Five answers might I give Despite my ever-changing mask No err will you forgive I may appear a fickle host But we’re both keeping score From the side, I will riposte ...
5
votes
1answer
993 views

Solutions for generic polyomino puzzles

Inspired by Mosaic with tetris blocks I was wondering if there were any generic algorithms to solve or show there was a solution to these types of problems (i.e. placing polyominos on a 2D board). ...
3
votes
3answers
713 views

What am I? Can you figure it out?

I love to eat my younger brother. Our Intelligience is never ending. My younger brother is very famous. We have days devoted to us. A very simple riddle. The first line is very important. (Not ...
160
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 ...
7
votes
3answers
2k views

riddle - pray you can find the word!

To answer this riddle, solve each of the four lines independently and put all the clues together to get a one-word final answer. Nonsensical abstraction high up in the army; The woman with the wheel ...
7
votes
3answers
5k views

Mysterious Murder Mystery 4

The sky is dark, filled with black clouds. The sun, high in the sky, still shining, trying to cut through the dark, thick, black clouds. The moon, slowly turning red, slowly taking over. You hear a ...
5
votes
3answers
1k views

I change when to where - another riddle

I managed to write a rhyming one this time! I sound like a sieve, But knowledge I give. I change when to where; Just find the right square. A cycle moves me to the right, But never entirely out ...
5
votes
2answers
971 views

Have You Tried Turning It Off And On Again? (Vigenere cipher)

So here's a little puzzle for all of the IT crowd out there. It demonstrates the Vigenere cipher, the unexpectedly strong 'chiffre indéchiffrable'. The Wikipedia description explains how you can use ...
12
votes
11answers
3k views

Who or what are we?

One I made myself. Have fun! You need me. You need me in many ways. Yet, I'm slowly losing my family. You can count on me as you always did! The sound of an explosion, transferred to the orange ...
6
votes
1answer
857 views

The man, the weapons, the time

STORY: He awakes, covered in quite a thick layer of dust. Quite clearly suffering from some form of memory loss, this man begins to look around, eyes blurry, almost sticky in feeling. There's bodies ...
9
votes
1answer
541 views

Optimal building strategy puzzle with airdropped mining bases

The general from Optimal Building Strategy Puzzle is in a conflict with another general. This general is from another faction with 3 major differences in his technology: Instead of the worker having ...

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