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16,967 questions
2answers
84 views

Time detective duty

Consider that you have a beautiful wife (husband). But your after-marriage life is not so beautiful. Your wife (husband) has performed a first adultery act 5 years after a marriage with you and later ...
1answer
48 views

What's the solution of this Raven's matrix? (2) [duplicate]

here's another matrix which I don't understand: What's the solution and why? Thanks!
1answer
1k views

Can you cover a cube with copies of this shape?

The following shape has an interesting property: It is possible to map multiple copies of this shape onto the surface of a cube in a way that perfectly covers the entire cube with no gaps and no ...
3answers
1k views

Catching a robber on one line

At x = 0, a thief robbed a bank. The thief ran one of two known directions at a constant speed, towards x < 0 or towards x > 0. The cop arrives at the crime scene some unknown time after the ...
2answers
161 views

Preparing for the End - Riddle

This is the end. I knew it was coming. All of my ends are tied up, I'm ready. Only a few more minutes to spend. I blame you for this. You killed the messenger. I strained and cried ...
0answers
53 views

Distinct SemiPrimes with Close Factors

I'm in the midst of developing a game for several friends as a friendly competition. It begins with generating the largest distinct semiprime feasible with factors that closely related in length ...
4answers
174 views

Problem with heights - Riddle

I hate heights. As soon as I can see how far away the ground is, I'm filled with this uncontrollable fear and urge to get down -any survivable way to get down is better than this. My captors seem ...
0answers
65 views

1answer
114 views

Rhyme with Time

Commonly used units of Time are: $Second$ $Minute$ $Hour$ $Day$ $Week$ $Month$ $Year$ $Decade$ $Century$ $Millenium$ Can you find at least one rhyming word in English Language for each of ...
4answers
3k views

Fastest way from 10 to 1 with everyone in between

I got inspired by this question from trolley813 to make this puzzle. How fast one can get from TEN to ONE, passing each number in between? The rules are simple: You are only allowed to change ...
1answer
133 views

Fill.in the two missing terms in this Simple Sequence

What are the two missing numbers in the sequence shown below: \def\S{\phantom{XX}} \large\begin{array}{|c|c|c|c|c|c|}\hline \S&\S&\S&\S&\S&\S\\[-10px] 4 & 5 & 6 & 7 &...
1answer
128 views

What's the solution of this Raven's matrix?

I'm practicing with Raven's Matrices but I don't understand this one. What's the solution and why? Thanks!
1answer
6k 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?
0answers
68 views

Can this Rubik's cube be solved? [duplicate]

All sides of the Rubik's cube are solved, except the corners. And these corners need to be swapped.
1answer
92 views

How to swap adjacent corners?

I want to swap adjacent corners of U layer, the only thing I care is: position of other 6 corners. I don't care: orientation of all corners position of all edges orientation of all edges The goal ...
5answers
273 views

A Humourous & Simple Selfmate In One

Here's simple and humourous chess puzzle that I created after a few non-consecutive hours. I had to prove the concept feasible while making it as economic as possible. White To Move, And Selfmate In ...
1answer
60 views

Musical Chairs Cipher: Intermediate

This question is a continuation of the first question: Musical Chairs Cipher. The basic rules: Six children -- Alice, Ben, Carl, Denise, Eddie, and Flo -- are playing a game of musical chairs in ...
2answers
235 views

A Device Riley Riddle

My prefix may be what a device can be on My infix is most likely in your device My suffix is what devices can be My whole is a reverse motion Hint:
0answers
19 views

Upside down A (for all) [migrated]

I am working on a voltmeter and the tolerance for it is 0.25% upside down A (for all) 1 digit. I am not sure what exactly what this means. I am guessing if my value was 19.95 'for all' could mean I ...
4answers
234 views

Savage Road Signs (Part 2)

Please read part 1 or this might be confusing Since part 1, you have replaced the stolen stickers and your daughter has forgiven you. The highway ended up being a full 700km long, so you are happy ...
0answers
105 views

Don't even try, no need [closed]

Here is the a resume of this post: Downvotes on this post, Once you get to the end of this riddle you will get it, Am I playing with words? Nah, I'm making everyone look stupid, Some of you will be ...
2answers
85 views

Lunatic Loves this Sunny Sequence…Find the Missing info

Complete this Sunny Sequence, Based on the information given below:
1answer
132 views

Change EDIT to UNDO

On your computer right now, you can probably click on the "Edit" menu; and one of the first options will be "Undo". These are closely associated words. But how close are they in a word ladder? ...
3answers
183 views

16 people, make 3 consecutive round of 4 players

I am struggling with this issue for a tournament I am planning. Take 16 people. Consider a 4-player game. To be clear, in each round all 16 players must play the game once. I want to make at least 3 ...
1answer
653 views

I am caught when I was about to steal some candies

I am a eight years old boy, I love candies, but my mom does not want me to eat any more candies because I start to have black teeth :( but I still love candies so... Today when I was about to steal ...
6answers
4k views

Can you open the door or die? v2

This is the follow up question to my previous question You wake up and find yourself in a very strange room with a single door. You find a note on the ground surrounded by lots of cards: ...
2answers
108 views

Pan Digital Lucky Seven wants you to figure out all the digits

$Given$: A, B, C, D, P, Q, R, S, T are distinct digits varying from 1 to 9. AB, CD, PQ, RST are all concatenated Numbers. From the given expression , figure out all the digits to make lucky seven. ...
5answers
4k views

Fastest way from 8 to 7

Inspired by this great question by Uvc (actually, it's the same logic but with different words). How fast one can get from EIGHT to SEVEN? The rules are the same: You are only allowed to change one ...
3answers
214 views

What are the missing members in this sequence based on the digits 0 to 9?

Find the missing members? 0, 0, 2, 0, 2, 3, 0, ?, ?, ? Hint 1
4answers
2k views

Savage Road Signs

There is a highway that starts in the city of Savage. You must must place distance marker signs on this highway for the outgoing traffic. According to highway code, there must be a distance marker ...
4answers
2k views

Can you open the door or die?

You wake up and find yourself in a very strange room with a single door. You find a note on the ground surrounded by lots of cards: There are 66 green and 66 blue door cards on the ground. If you ...
1answer
62 views

CiSRA Puzzle Hunt Backups?

I found this article describing what makes a good puzzle, and it references several puzzles which, as best as I can tell, were designed for something called the CiSRA Puzzle Hunt. However, the website ...
1answer
75 views

Primes and Puzzles are my Passion. Combining them here to get Productive Prime Puzzles..Find the Missing Info

$EXAMPLE$: $997$ = $O.$ $T.$.- $T.$ One Thousand - Three $Expand$ on the Full Info of the following Prime clues. A). 2 = F & O. E. P B). 3 = S.P C). 5 = F. On the H. D). 7 = H. of ...
1answer
166 views

Stars of the Celestial Bagua

Check this out: Okay, it might be more impressive if I show you what is moving along the arrows: At every vertex in a long word. Flowing in to every vertex are two short words ("inputs"). ...

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