# All Questions

16,712 questions
19 views

### Make N N N equal to 6 where N is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Using standard mathematical symbols, (i.e. no other letters or numbers), make the following true: ...
7 views

### Why This Simple Puzzle is imposible to solve?

connect every red circule to black circule by drawing line and line should not touch eachother it means from every red circule must be draw 3 lines connecting red circules to black circules but the ...
6 views

### UVC wants to give you a Helping Hand in Solving these Unique Set of Pan digital Fractional-Decimal Relations

Use pure logic and deductive reasoning only. Document detailed steps in arriving at final solution. You can use calculator minimally. $Given$: Utilizing These two unique set of Pan digital ...
1k views

### Pirate democracy at its finest

With our pirate crew becoming too big, the captain grew very concerned about splitting all the treasure - we continued to split it equally, but, of course, each crew member got less and less with the ...
6k views

### Make 24 using exactly three 3s

Make 24 using exactly three 3s Each number formed with a 3 and the 24 in the equation are all base 10. You cannot introduce any additional digits or constants. Plus(+), negation/subtraction (-), ...
698 views

### Find this cartoon

From the pictures below, can you find the cartoon character? EDIT: Edited the 3rd picture for clarity HINT 1 HINT 2 HINT 3
67 views

This puzzle is part 22 of Gladys' journey across the globe. Each part can be solved independently. Nevertheless, if you are new to the series, feel free to start at the beginning: Introducing Gladys. ...
67 views

### Devil in Different Disguises but in Prime Shape…Can you Figure out his Diverse Expressions?

$Given$ $Devil$ goes by $666$ Express him as 1). Sum of all Primes in 3 Different ways using all the digits 0 to 9. Use only + sign. 2). Sum of all Squares of Primes. Use only + and ^ signs. 3)...
187 views

### Three numbers, three words

Given only these 3 numbers below, find the 3 words related to: An animal A car brand A drink Numbers: 456448711 875654332 7456987877 Hint:
186 views

### A Multitude Of Mates In 5-An Original Chess Puzzle

Here’s a toughie for you-and no computers allowed! I have created this unique chess puzzle which white mates black in many different ways, all in 5 moves, no matter what black does. Options do exist ...
233 views

### A fortified nonogram

This puzzle is part 21 of Gladys' journey across the globe. Each part can be solved independently. Nevertheless, if you are new to the series, feel free to start at the beginning: Introducing Gladys. ...
120 views

### The Tiled Labyrinth Returns

This is a variant on The Tiled Labyrinth. The rules are the same, except that the goal has changed. You will probably want to use this script which was created for the initial puzzle but applies ...
134 views

### Can you Crack Cohen Family’s Cryptic Codes?

Cohen family of four ...each have their own single numeric code to generate first level access to the system. Before first level access is granted, system displays any one of the 4 single digit codes. ...
275 views

### Kara's bitmap picture

Kara recently received a puzzling bitmap image by email in the shape of a trapezoid. She didn't recognize the email address, and she doesn't know why she would be receiving such a picture. She ...
283 views
+100

### Breaking Balance (Part C)

For a starting number of otherwise identical coins there are among them TWO IDENTICAL counterfeit coins which are either heavier or lighter than the rest. Using a three-pan balance (described in ...
112 views

### Where Am I? In Mexico City (Level One)

Well, this is a "Where am I?" puzzle set around Mexico City Metro. Remember that three is important. You have only the picture. This is short, and I think it's easy. Hope you like it!
94 views

### Sequence of close numbers

I just came up with the following sequence of numbers. 25 26 27 28 30 30 ... They all seem to be very close to one another... but what is the next number in the sequence? And what is the principle ...
5k views

### And and… and. And.?

This is a cool riddle, which my Maths teacher taught our class, 25 years ago. I still remember it and find it very cool. Can you create a perfectly valid English sentence, which makes perfect sense, ...
277 views

### What's the next image 2?

Can you help me with this one: It is from a local IQ test from the schools in Vratsa, Bulgaria.
3k views

### How can the “Boy or Girl” paradox be worded unambiguously?

The first time I encountered the Boy or Girl paradox I was struck by how ambiguous all of the formulations in English are. As Wikipedia notes: Gardner argued that a "failure to specify the ...
63 views

### what 3D shape can be used to make any 3D shape when combined With itself? [on hold]

Looking to create a puzzle / representation of any 3D shape using smaller 3D shape. Is there some sort of shape / ultimate 3D shape that can make any other 3D shape. Like a pyramid or sphere or cube ...
1k views

### Logic behind numeric sequence

There was this sequence on a magazine and the reader has to find the next number: 10, 2, 4, 6, 2, 8 I couldn't find one, then I found the answer in the next magazine. They say the number is 5, so ...
144 views

### Number sequence puzzle; 2, 10, 44

Predict the next three members of the sequence below and explain what the relationship is. 2, 10, 44, 1012, 248, Hints will follow if required. This number sequence does not appear in the Online ...
748 views

### Find the three digit Prime number P from the given unusual relationships

$Given:$ P is a 3 digit prime number Q,R,S,T are distinct digits( 0 to 9 ) QRS is a concatenated number $Relationships:$ $P$ = $QRS + T$ = Reverse of $( QRS * T)$ Find P using just ...
555 views

### Maximum Result with Digits

You have digits from $0$ to $9$, where you need to use every digit only once, and you have only one operator (multiplication, $*$). You may combine/join digits to create a bigger number as shown below:...
141 views

### One word: find it from these three lines [on hold]

I went to paint in the nature. Alas, I got a nasty infection. I did recover by medication.
288 views

### Hiker’s Cabin Mystery | Pt. VII

Congratulations to @GarethMcCaughan for his victory on the long unsolved Part II of this mystery! Kudos! Part VIII will hold a not-so-fun twist! Solve this one quickly, and we can get to it! New ...
126 views

### Breaking Balance (Part C-minor: easy version!)

Identical to Breaking Balance (Part C), except with two weighings. For a starting number of otherwise identical coins there are among them TWO IDENTICAL counterfeit coins which are either heavier ...
66 views

### A very basic number sequence puzzle

Predict the next members of the sequence below and explain what the relationship is. 2, 10, 101, 1211, 14321, ...
65 views

### Word Transformations

I am a gap Rearranged, an accelerator Take one and rearrange, an animal Rearrange that, a skin condition. I am a gap Take one and rearrange, a garden tool Take one ...
2k views

### A married couple

Disclaimer: This puzzle is from a university in Israel, computer science. Its in a real document written in Hebrew so no point in posting it. There is no link to it on the internet. There is a couple ...
569 views

This puzzle is part 20 of Gladys' journey across the globe. Each part can be solved independently. Nevertheless, if you are new to the series, feel free to start at the beginning: Introducing Gladys. ...
252 views

### How to Modernize Student Council

You are the math teacher at a high school and you are in charge of organizing Student Council for the whole school next year. Your boss, the Principal, read a research paper on Student Councils and ...
490 views

### Drums and punctuation

This puzzle is part 19 of Gladys' journey across the globe. Each part can be solved independently. Nevertheless, if you are new to the series, feel free to start at the beginning: Introducing Gladys. ...
93 views

### Mensa 3rd Grade Recess Game [on hold]

Mensa 3rd Graders At Recess There are dozens of variations of this puzzle type, but I put my own spin and characteristics to it. It is lunch time for the little ones at Mensa Mini's Private School. ...
201 views

### What words Atbash plus Caesar cipher to other words? [closed]

If you Atbash cipher plus Caesar cipher after, you get a new set of ciphers, and I tried 4-letter words for Atbash plus Caesar shift 1 and I got: cams <-> yaoi ghat <-> Utah haji <-> tars ...
575 views

### Why are these shapes impossible to draw with the given rules?

The image above shows a group of shapes, all with lines leading to their center point. These shapes cannot be drawn with the following rules: You may not trace over over an already existing line. You ...
205 views

After pressing the button, the walls opened. This time, instead of a damp smelly room, a futuristic lab appeared. "What the-" exclaimed Cyrus. T.E.D. scanned the whole lab quickly. Cyrus ...
75 views

### Hiker's Cabin Mystery | Pt. VIII

Part VII is still up for grabs! At last! You've solved the mystery of the cards! Now that you've gotten into the hiker's computer in the hotel room, it's time to explore! Good news! There is only ...
173 views

### A number of representations

What number, when used to represent all numbers, can be used to represent something else? To get credit you need the number and the reason behind it. EDIT1: Given the answers so far I feel I should ...
92 views

### 9x9 Map Path: In and out next to each other?

This isn't something I read in a book or anything, it's more of a puzzle I thought up for myself. However, I am unable to find a solution. Here's my problem: If I create a 9x9 checkerboard, and ...
237 views

### WAS IT A CAT I SAW? Do Some Detective Work & Catch The Imposters

Carolina County Community Cat Conference is going on at a resort exclusively reserved for Prime Members. Some look-alike impostors, aka cats, have sneaked in. They all wear fancy name tags that ...
111 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, ...
579 views

### What is a Useful Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it a Useful Word™. Use the examples ...
621 views

### Check out my bookshelves

It's always fun seeing what other people have on their bookshelves. Here's one of mine. But this isn't just a chance for a quick snoop - what I want to know is How are the books ordered? Hint 1 (...
104 views

### Famous Number Displays Dual Cubic Relationships..Figure it out

$Given$: A, B, C, D are all distinct digits. ABCD is a concatenated number $ABCD$ = $A^3$ + $(A+C+D)^3$ = $D^3+ (A + D)^3$ Figure out this Number and why is it Famous? Also provide ...
121 views

### What is an Even Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it an Even Word™. Use the examples ...
109 views

### On a puzzling spree

This puzzle is part 18 of Gladys' journey across the globe. Each part can be solved independently. Nevertheless, if you are new to the series, feel free to start at the beginning: Introducing Gladys. ...