Most Popular
1500 questions
40
votes
5 answers
A Suspicious Mail
It's an average normal everyday day. You find a piece of mail in your mail box. It doesn't look like the rest of them:
The text reads
VVJHRU5UISBQbGVhc2U
gYXR0YXRjaCBvdXIgbmV4dCBsaW
ZlIGFuZCB5b3VyIHB1YmxpYyBrZXk
gYW5kIHJldHVybiB0byB1cyB3aXR
…
pfg
- 1,230
- 8
- 19
40
votes
4 answers
Break the subsitution cipher with a twist
Breaking news: the NSA can break letter substitution ciphers. (Letter frequency, guessing the word "the", et cetera...) So, let's make our secret code more secure. Let's apply the secret substitution n times to the nth letter of the message.
Here's…
Lopsy
- 7,964
- 30
- 54
40
votes
3 answers
Twisted TV Titles
This is a puzzle I created for a road rally / puzzle hunt a few years ago. It shouldn't be very difficult but hopefully will be a bit of fun. This is my first puzzle, so I welcome any feedback in the comments.
TWISTED TV
The creators of this…
Pugmonkey
- 4,364
- 17
- 23
40
votes
6 answers
Changing baby's shirt
Baby needs a change of shirt, but baby is also sucking on a bottle (see this stock photo for a visual). If the bottle leaves baby's mouth, baby will start crying. Also, baby loves holding the bottle himself, so he needs to be holding the bottle…
Tyler Seacrest
- 9,174
- 2
- 28
- 62
40
votes
5 answers
Duel between the knight and the dragon
A dragon and a knight live on an island where the only sources of fresh water are a pond (containing ordinary water) and six wells, numbered 1 to 6. Each well's water is completely indistinguishable from the pond water, but contains a magical poison…
Neil
- 2,116
- 2
- 18
- 26
40
votes
3 answers
How many liars are in the room?
There are five people in a room. Each person is either a knight, who always tells the truth, or a liar, who always lies.
Each person is asked the following question:
How many liars are among you?
The answers are: "one", "two", "three", "four",…
Smart
- 4,492
- 5
- 24
- 40
40
votes
6 answers
Sudoku embedded in a Kakuro
In addition to standard Kakuro rules, the grey shaded cells must form a valid Sudoku solution.
One sum in this puzzle has been corrected from 28 to 23. Fortunately, it was in a location that nobody has resolved yet, so everybody's progress up to…
paramesis
- 4,619
- 17
- 34
40
votes
5 answers
Making 103 from 4 zeroes
As the title suggests, the puzzle here is making the number 103 by using exactly four 0s and the following operations:
$+$ Addition
$-$ Subtraction
$\times$ Multiplication
$\div$ Division
$\sqrt{a}$ Square Root
$\sqrt[b]{a}$ Arbitrary Roots
$!$…
noneuclideanisms
- 6,268
- 20
- 51
40
votes
1 answer
Yes, your fat ma is hers
Inspired by Elephants always get four mice.
Start with the phrase Yes, your fat ma is hers and perform the following steps, in some order, to find a famous quote:
Rearrange the words.
Remove a single letter from one word.
Reverse one word.
Remove…
Rand al'Thor
- 116,845
- 28
- 322
- 627
40
votes
1 answer
What number should be the answer to this question?
Now that my first puzzle's done and gone it wont be so easy to solve the rest.
I've begun to write with reestablished rules.
If I've not got your attention I'll start trying harder.
So weigh the options and look closely,
It shouldn't be hard for you…
mkinson
- 1,615
- 10
- 24
40
votes
1 answer
Introducing: Number Slope™
Number Slope™1 is an original2 grid deduction puzzle similar to Sudoku. It is solved on an n-by-n grid, tiled with n n-ominoes. The rules are:
Each number from 1 to n must occur once and only once in each row, column, and n-omino.
Any row or column…
Volatility
- 5,099
- 1
- 21
- 42
40
votes
6 answers
One rectangle, indivisible
Here is a rectangle made out of 2x1 dominoes:
It can be divided along a line into two smaller rectangles:
What is the smallest (in area) rectangle of (edit) multiple 2x1 dominoes that cannot be split along a line into two smaller rectangles?
Owen
- 1,479
- 13
- 17
40
votes
3 answers
Here's what I do, tell me what I am
As a whole, I can
Decide how serious or down-to-earth you are,
Arrange a trip for you, or even
Pull your leg!
Remove the first three vital letters of me, and I am
Dying of gloom and dullness,
Solving puzzles in a shrine,
Not the one making your…
Ankoganit
- 18,612
- 3
- 74
- 133
40
votes
4 answers
Turn 4x4x4 Rubik's Cube into 3x3x3 Rubik's Cube
I have a 4x4x4 Rubik's Cube, but all I want is a normal 3x3x3 Rubik's Cube.
Luckily, I also have an unlimited supply of small pieces of tape. Each piece of tape can cover the face of two neighbouring squares on my Rubik's Cube. When two pieces are…
JenserCube
- 695
- 6
- 11
40
votes
3 answers
No, It's Not A Polynomial
There is a simple way to generate every one of the thirty-seven numbers below. They form a closed set; that is, there are no more numbers with this property. My apologies in advance if this doesn't go as planned. This is my first number pattern and…
Hugh Meyers
- 23,712
- 1
- 52
- 171