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-2
votes
2answers
3k views

Find the missing number in the series: 253, 495, 143,?

Find the missing number in given series: $253, 495, 143, ?$ $152$ $105$ $903$ $374$ Okay, so I'll tell you what I could do: The first number is $16^2-1$ third number is $12^2-1.$ Moreover, the ...
10
votes
1answer
695 views

Let's revisit this later (a two player knight's game)

Alice and Bob play a game on the following irregular chessboard. (Note the blacked out squares are not legal moves.) Alice starts the game by placing a knight on any square she chooses. They then ...
5
votes
1answer
343 views

A powerful vice. Who am I?

Fine, precise, a powerful vice. I draw up blood, thin crimson penned; Yet with never a wound can I contend. Under careful conditions am I used, although on occasion I've been ...
9
votes
2answers
342 views

A curious circuit

During our latest space mission to Mars, humankind has retrieved a curious alien circuit. Our historians think it must be a calendar of some sort. After speaking with some alien linguists, we know ...
4
votes
2answers
251 views

Guess the song and artist (3)

Enough of the maths clues (well partially!) - something more literary: Romulus and Remus; Mowgli.
14
votes
4answers
607 views

The answer to this puzzle is… [closed]

What is the answer? Hints: This puzzle is too vague This puzzle is still incomplete There is not enough information to determine the answer When this puzzle is complete the answer will read as ...
3
votes
1answer
214 views

Guess the song and artist (2)

$$\lfloor \nabla_{\mu} X_{\nu} + \nabla_{\nu} X_{\mu}\rfloor = 0$$
26
votes
3answers
2k views

Tell me who I am: To lead, she leads, daughter my

I am not married, but a daughter have I And to lead, she leads, daughter my I was part of the li'l boy that once rocked history I am just you, I ain't a mystery Who am I?
6
votes
2answers
501 views

You frequently use me on the net. What am I?

I am a six letter word. My 1,2,3 is very abundant on earth. My 2,3,4 is an organ. My 3,4,5 is part of circle You frequently use me on the net. What am I?
6
votes
0answers
125 views

Good Crosswords [closed]

I'm looking for a good online crossword that I can do when I have breaks in my day. Since I'm a web designer, I want something that has a well designed website. Also, since I like to think I'm smart, ...
4
votes
1answer
337 views

Who are the guilty parties? #3

You've barely got back from the isolated villa where your last case was, when you hear that you are needed again: There is a group of people on board a yacht. The wealthy owner and her spouse have ...
12
votes
1answer
365 views

Fitting the pieces

The following grid has been constructed using the shapes of unfolded cubes. Determine the minimum number of shapes (red and green) needed to cover the blue grid. The shapes may overlap, but must ...
10
votes
4answers
570 views

I am the god who said no more! Who am I?

I am after and before I am the god who said no more! A fraudulent rose, now set free The foundation sat upon me. Who am I? Hint:
0
votes
2answers
328 views

What can't you learn?

My first riddle, it's probably too easy though. You can get almost any knowledge from one book or another, but there is one thing that is absolutely impossible to learn from a book. What is it? I'm ...
19
votes
1answer
530 views

Guess the song and artist

\begin{array}{l} &19\times 46=784\\ &56+43=102\\ &360\div 15=29\\ &196-55=114\\ \end{array}
3
votes
2answers
184 views

A question of.. Probability! [closed]

You have six loaded dice (I mean falsified, non regular). In the first die there is always a $10\%$ of probability for $1$ to come out. In the second die there is always a $20\%$ of probability for $...
13
votes
4answers
3k views

Cutting a 10-by-2 rectangle

How does one dissect a $10\times2$ rectangle into four pieces that can be reassembled to form a square?
10
votes
2answers
1k views

An old square castle with many square rooms

The grandfather of my friend Bob has built a perfect square castle for himself and his family and divided it into 9 perfect square halls and made an armoury in the middle one. Bob's father divided ...
4
votes
3answers
956 views

The blind man and the broken cube

(My previous question was maybe a bit too easy. This one is just slightly harder...) Twenty-seven white blocks are assembled into a single cube and its outside is painted blue. Foolishly placed on ...
4
votes
1answer
128 views

Pawn-free squares

The chessboard below contains two pawns. How many squares (of any size) does not contain a pawn?
-3
votes
2answers
488 views

Guess the missing alphabet!

What is the missing alphabet in below sequence? M T W T _ _ S
-2
votes
2answers
242 views

What is special about this number?

The number is 154967328. No other information is given, except that it's possible to answer in a minute (so no complex calculations). What is specil about the number?
6
votes
6answers
434 views

Good resource for daily Sudoku Puzzles

I love solving puzzles, It keeps my brain active. Previously I used to solve newspaper Sudoku which were fairly easy. Then I solved some interesting puzzles in the ...
-2
votes
2answers
235 views

What cannot stand outside a door? [closed]

Let there be a house of which there is a beautified front door that is closed. Now: what is that "thing" for which it is impossible, logically (and irrefutably), to be outside this closed door?
8
votes
3answers
3k views

Chopping a cube into different sized subcubes

You are the author for the magazine Extreme Cuisine Quarterly. Your articles are not concerned with cooking, but rather with the presentation of the meal. Recently, there have been rumors of a ...
10
votes
5answers
4k views

Using a balance to determine any weight with a set of weights weighing powers of 3

There is a scale with an object on the left-hand side, whose mass is given in some number of units. Predictably, the task is to balance the two sides. But there is a catch: You only have this peculiar ...
30
votes
1answer
1k views

Solving an encoded message at the bottom of a Bletchley Park mug

A while ago (maybe even a few years ago) I was given a Bletchley Park mug that is black when cold. When it heats up (from having a hot drink inside it) it turns white and reveals a sequence of ...
-1
votes
8answers
634 views

Describe a large integer

What is the largest well-defined finite integer that you can exactly describe using unabbreviated English words (no symbols and no letters from other alphabets), with no repeated letters. Any ...
11
votes
1answer
454 views

05132: Some off facing?

You open a file and see the following codes. What do they mean? ...
5
votes
1answer
372 views

Who Are The Guilty Parties? #2

You've barely got back from the island where your last case was, when you hear that you are needed again: There is a group of people at an isolated villa. In a curious twist, the aristocrats have ...
14
votes
2answers
424 views

The moody boxers

A certain group of $n$ boxers is totally ordered by strength; if boxer $X$ is stronger than boxer $Y$, then $X$ wins every single fight against $Y$. The ordering itself is not known to us, and we do ...
7
votes
3answers
2k views

Can you make 10 triangles with just 10 sticks?

Can you make 10 triangles with just 10 sticks? The sticks don't have to have the same length. Hint 1: Hint 2: There are several other possibilities than the one I gave hints for. I recently found ...
8
votes
2answers
549 views

What is an Alpha Word™?

If a word has a certain property, I call it an Alpha Word™. Based on the following list, determine the rule governing if a word is an Alpha Word™. ...
2
votes
1answer
561 views

Who are the guilty parties? #1

(Your investigations continue here.) I am testing this puzzle to see how it works, and gauge the difficulty. I have plans which will be unveiled in future puzzles of a similar nature, pending ...
2
votes
1answer
218 views

Magic: the Gathering - Impending Annihilation

Background Normal MtG rules apply here. Your solution must work regardless of any possible choices made by your opponents; assume they do whatever makes it most difficult for you to win. If you ...
11
votes
3answers
778 views

Icosikaitrigons

Original Q: Plot 24 points so that there is only one 23-sided polygon where 23 of those points are its vertices, and the other point is not on any edge of the polygon. A polygon, here, is defined as a ...
17
votes
1answer
2k views

To Catch a Thief

In Alfred Hitchcock's movie "To Catch a Thief", the retired infamous jewel thief John Robie has to crack a safe with a complicated $4\times4$ pattern of keys. Each of the 16 keys is either turned ...
2
votes
1answer
338 views

The Six-Edged Sword

Your friend buys a new ninja sword online, but when he receives the package it is shipped to "seltruTajniNtnatuMeganeeT" and contains this message written in the inside of the box: bggp tp fjcg ...
15
votes
3answers
2k views

Trying to understand an unusual timestamp encountered on the web

I am writing an API to crawl a popular website, eksisozluk, kind of like Turkey's reddit, but more text based. On this website, you can get a list of the popular posts from the path /basliklar/...
3
votes
1answer
253 views

Magic: the Gathering - Challenge #7: In Your Dreams

Previous Challenge Background Normal MtG rules apply here. You may not assume that your opponent will cooperate with you (e.g. choose not to block any of your creatures when they can). Assume that ...
7
votes
1answer
689 views

The Beautiful Ladies' Brothers

The ladies mentioned in Five beautiful ladies have five brothers: Adam, Bob, Charlie, David, and Edward. Three have hazel eyes and are honest; two have lime-colored eyes and always lie. You are ...
4
votes
2answers
1k views

A coin flip's long tail

I have a (possibly-) unfair coin, which lands heads with probability $p$ and lands tails with probability $1-p$. I toss it twice; the tosses are independent and identically distributed. The ...
5
votes
1answer
366 views

Friday the 13th poser

Find a year that has three Friday the thirteenths in it, either past or future. (That is, find a year where the thirteenth of the month falls on a Friday in three different months.) Find a year with '...
14
votes
1answer
1k views

Ernie and the slice of Pi

Ernie is a renowned polyglot. Why just last week I saw him helping out at a Mathematics conference by acting as a simultaneous translator for seven guests who only spoke Hungarian, Icelandic, Swahili, ...
1
vote
1answer
198 views

Magic: the Gathering: Flavor Test

Below is a list of encoded information regarding popular flavor texts of MtG cards. The numbers listed refer to the number of letters in each word of the text. Punctuation has been preserved. The ...
7
votes
3answers
986 views

Adam commutes to school

When the volume of the sound is low, Adam walks home from school. When the volume of the sound is high, he gets a ride. Why?
3
votes
2answers
2k views

Algorithm for a single diagonal on each face of the Rubik's Cube

Right now I am trying to get the following distorted position: On each face only one diagonal is solved and the rest of the cubes are a different colour than the diagonal. For example: If I am ...
8
votes
1answer
356 views

Mixed-up quotations

I was looking up some quotations the other day by a famous person. The following three quotations were all made by the same person, but somehow they got mixed up before I could read them. Can you ...
12
votes
1answer
561 views

Word Categories

Below are three groups of clues. Within each group, the answers share a common characteristic. The groups also share a common characteristic. Solving any one group should make it much easier to solve ...
5
votes
1answer
2k views

Can anyone help me identify these logic puzzles?

Can anyone help me find out what these kinds of puzzles are? 1. B&W Grid Puzzle There's a grid with black & white blocks. A black block will turn white if it's surrounded by 3 white blocks. ...

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