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6 Tries to Guess a Number Between 1-100

After every time you guess, you're told if you're right, too high, or too low. Is there a strategy you can use to guarantee you'll get it on your 6th attempt (or lower)? I know a strategy to get it ...
11k views

23k views

Mensa online IQ test question - big and small squares on a horizontal line

Doing the Mensa online IQ test at http://test.mensa.no/, I was puzzled by this exercise. I understand that asking for answers like this kind of defeats the entire purpose of the test, but it's stuck ...
2k views

20 coins on the table

Two boys , Brian and Gabe, decide to play a game. They lay 20 coins on the table. Each player took turns taking 1, 2, or 3 coins. Whoever took the last coin won. Brian thought if he went first, he'd ...
3k views

10 prisoners and 10 lists of numbers [duplicate]

10 prisoners are held captive by a cruel warden. One day he gathers them in the prison hall and tells them about a new game he wants to play: "Tomorrow, I will assign each one of you a random ...
1k views

Horses and Tracks

I have seen this question before and I am intrigued that there might be various ways it can be solved. I do know of one way, but I am trying to find out if there is any other approach possible. The ...
507 views

Twelve Labours - #07 Cleats 'N' Balls

This puzzle is part of the ‘Twelve Labours’ series, but can be solved independently. Previous instalments can be found here: Prologue | 01 | 02 | 03 | 04 | 05 | 06 Emerging from the barbers with a ...
4k views

The seven piece silver chain

You have to stay for 7 days in a hotel outside your city. But you forgot to bring your credit card and are out of cash. You have a silver chain with 7 links. The rule in this hotel is that residents ...
927 views

A new word puzzle

Here is a new, original puzzle that I have made! You have to find the word that I describe. Me, I am an introduction My anagram is past tense of what you are doing now. The homophone of my anagram is ...
246 views

Four Directions #2 - Where and what am I?

To the North is a place you could wear on your feet To the South is a place that could mean alone To the West they play a ba' game in the street To the East is where Hallvard sits on his throne I've ...
7k views

Help understanding the solution to a “shooting puzzle”

I need help understanding the solution to the following puzzle: Puzzle: There is a "triangular" duel between the three shooters. Everyone shoots one by one, can shoot once and any person he wants. ...
186 views

Four Directions #3 - Where and what am I?

To the North, a mule may serve you in copper. To the South, you may end up rich or a pauper. To the West, "Keep it Weird" you may hear them mutter. To the East, if you visit, bring plenty of butter. ...
565 views

Tiling rectangles with W pentomino plus rectangles

Inspired by Polyomino Z pentomino and rectangle packing into rectangle Also in this series: Tiling rectangles with F pentomino plus rectangles Tiling rectangles with N pentomino plus rectangles ...
305 views

Piece de Resistance - Seven Images Are Worth Digits

Seven Images Are Worth Digits This puzzle is part of the "Piece de Resistance" series. Go back to Part 1 (Ace) for the story.Ace Two Three Four Five Six Seven ... Another colourful piece of ...
920 views

See me once, See me Twice #7

Here I am again, with another See me once riddle. Have fun! See me once, at the start of the week See me twice, the men becoming bleak See me once, when gambling on chinese ground See me twice, saved ...
1k views

What is the solution?

What is a word made up of 4 letters, yet is also made up of 3, Sometimes is written with 9 letters, and then with 4, Rarely consists of 6, and never is written with 5 ?
259 views

Tiling rectangles with T pentomino plus rectangles

Inspired by Polyomino Z pentomino and rectangle packing into rectangle Also in this series: Tiling rectangles with F pentomino plus rectangles Tiling rectangles with N pentomino plus rectangles ...
544 views

Tiling rectangles with N pentomino plus rectangles

Inspired by Polyomino Z pentomino and rectangle packing into rectangle Also in this series: Tiling rectangles with F pentomino plus rectangles Tiling rectangles with T pentomino plus rectangles ...
262 views

Tiling rectangles with V pentomino plus rectangles

Inspired by Polyomino Z pentomino and rectangle packing into rectangle Also in this series: Tiling rectangles with F pentomino plus rectangles Tiling rectangles with N pentomino plus rectangles ...
536 views

I make billions (#3)

I make billions (#3) My products are quite edgy, But most have been a bust, I'm only one of many, Lord knows who we can trust, I'm not a politician, Yet I work with presidents, ...
38k views

What color was the bear [duplicate]

This is an old one but I don't see it here. A man stepped out of his tent with his rifle and walked 1 mile south, 1 mile east and 1 Mile north. Then he shot a bear in front of his tent. What ...
2k views

A modified version of apples and oranges logic

Question: You have 3 baskets, one with apples, one with oranges and one with both apples and oranges mixed. Each basket is closed and is labeled with ‘Apples’, ‘Oranges’ and ‘Apples and Oranges’. ...
280 views

Find the value of $\bigstar$: Puzzle 5 - Every little Symbol

This puzzle replaces all numbers (and operations) with other symbols. Your job, as the title suggests, is to find what value fits in the place of $\bigstar$. All symbols abide to the following rules:...
215 views

Tiling rectangles with U pentomino plus rectangles

Inspired by Polyomino Z pentomino and rectangle packing into rectangle Also in this series: Tiling rectangles with F pentomino plus rectangles Tiling rectangles with N pentomino plus rectangles ...
1k views

A boy and his father [closed]

A young boy is taking a ride with his dad when a truck runs them off the road, killing the father and critically injuring the young boy. He's Medivac'd to the nearest hospital as the child is lying on ...
21k views

Hints:
37k views

How can 64 = 65?

Here is a interesting picture with two arrangements of four shapes. How can they make a different area with the same shapes?
15k views

A hunt for long forgotten treasure …but beware the pirate's curse!

I never really knew my uncle growing up. He seemed nice enough, but I got the sense from the distant, troubled look in his eyes that there was at least some truth to the rumours... Years before I was ...
493k views

Crack the lock code

Does any one know how to crack this? I got this as a challenge.
9k views

A mysterious email from Andrew Void

You are a secret agent in the service of the KGB, about to embark on a highly dangerous mission to infiltrate MI6. You have your disguise, your papers, and your backstory all prepared. The night ...
3k views

I can be 22 intrinsically and have a possible range between 22 and 96 (44 at the start)

I can be formed in many ways, and four parts are always involved. Sometimes the formation can happen with all four parts at once, but sometimes some parts come later than the others. The highest ...
5k views

Find a straight tunnel

There is a circular area with radius 1 km. And there is a tunnel, which is just under the surface, but invisible - unless you dig. It is known that the tunnel goes under the area (at least touches it ...
10k views

Challenge for lovers

One of my friends gave me this puzzle. Please help me find the answer for it. Jane and Mike have fallen in love, and Mike wishes to send her a ring via mail. Unfortunately they live in Kleptopia ...
4k 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 ...
10k views

The unexpected hanging paradox is as follows: A judge tells a condemned prisoner that he will be hanged at noon on one weekday in the following week but that the execution will be a surprise to ...
157k views

Four prisoners wearing black and white hats

There are four prisoners. All four prisoners will be freed, if at least one of them correctly guesses the color of the hat on his head. They can't speak to each other, and they can't touch each other....
7k views

You will have to pray!

This riddle is so easy that I already have created another one. Just in case. Anyway, please avoid wild guesses. For sure I am queer and out of place Are you still here? Go start the chase But ...
1k views

One beer too many

You're standing outside your apartment building after a late night out, with perhaps one beer too many, and you realize you have completely forgotten the code to get in. Luckily, you're a mathematical ...
17k views

How to cut 12 in half and get 7

Here's a puzzle that a teacher told me today: How can you cut twelve in half and get seven? Hint (only if you're stumped): Another Hint
7k views

Who has mud on their forehead?

This is probably my favorite puzzle. It uses logic, but it's not one of those "logic table" puzzles which i dislike immensely. What is this type of puzzle called and are there more like it ...
3k views

Riddled and Dismembered

The following is a riddle. Do not solve the riddle. Instead, explain the title. My top is tilted to the light, A trumpet, almost, in its form You court a woman? There I am. I please, palliate,...