I got this challenging geometrical conundrum from a Russian geometrical magazine. It states: (A. Soifer) Use six lines to cut a triangle into parts such that it is possible to compose seven congruent triangles from them. In other words, given an arbitrary triangle, how can you use six straight...

This is a puzzle based around a fictional language. The goal is to learn the language well enough to provide a close English translation of the 4 goal sentences. You do this by cross referencing the various pieces of information in the linked Imgur album (size limits prevent me from posting her...

Here's a computer based riddle for all the linux geeks out there: You just installed Ubuntu 20.04 on your shiny new laptop! The system boots you into your user and shows you the desktop. However, to your dismay, the drivers for your touchpad, USB ports, Bluetooth adapter and WiFi adapter were no...

In the spirit of the so-called Einstein Riddle, I think everyone should try to create their own version. So here is mine: Five farms are next to each other along a country road (like in the next picture). Let's call them Farm #1, #2, #3, #4 and #5 counting them from left to right.Their owners ar...

The following image shows two valid Sudokus. The first was copied verbatim off Wikipedia, and the second was obtained by rotating 90 degrees. Any two distinct valid Sudokus must differ in at least four cells. Given a completed Sudoku a legal "move" consists in changing exactly four cells to form ...

Here is a chess puzzle I have made . It needed a lot of thinking . If you are white , how would you play in this position ? State your best moves !! Please don't use Stockfish or Alphazero or any chess engine to answer this , if you definitely don't want to ruin the puzzle :) .

My prefix uses a force. My suffix is feeling certain. My infix is a legal force. I make you feel uncertain.

My prefix is a means of division, My infix is almost at the kirk, My suffix is just by provision, My whole is the result of hard work. What am I?

The string bellow is an encryption for the enigma to be solved. In order to find the answer you must: Discover what the dots and zeros translate to; Find the answer to whatever the decrypted text is! The string: 00000000000000000000.00000000000000000000000.000000000000000. 0000000000000.0000000...

Here is a question I've been having some trouble with. I'd love any of your thoughts. It is Question 3 in this entrance exam. Mr Cadbury was murdered last night. Exactly one of six suspects is responsible, and each has made three statements. Each has made at least one true statement. Moreover, t...

After being inspired by all the other word puzzles on here I am unable to solve, I decided to try to write my own. It might be too easy, but I hope you enjoy! My prefix is short for myself My suffix is metric My infix can be made from a tree My whole is something you can see

Find three positive integers with the following two properties: The sum of any two of them has digit sum less than 15 The sum of all three integers has digit sum more than 200

A very easy puzzle for the puzzlers here: I am found in the sea and on land but I do not walk or swim. I travel by foot but I am toeless. Who/What am I

"With three, you'll live forever, just two will kill you." short, but can't seem to come up with anything :/ attribution: part of a private group ARG game, created by one of the group members.

A mathematic riddle: If $1+9+8=1$, what is $2+8+9$? I know, many of you out-of-the-box-thinkers, I really like it, but please don't give answers to this riddle as $1=0$ and $9=0$ and $8=1$, that's why $1+9+8=1$. Good luck! As it has been solved here is the link for the puzzle.

The sequence is: 138, 29, 1, 382, 913, 8, X Possible answers: a) 9 b) 2 c) 3 d) 12 Note: This question is not mine and it was asked as an IQ question by a teacher.

A mathematical split: Can you split 34 into two parts such that four-seventh of one of these parts equals two-fifth$ of the other? These riddle is from a book so I can't give you a link.

(This is a question from a basic IQ preparation test) What can be the next column if we consider the following table of numbers? 86 65 44 X 93 64 35 Y X=23, Y=06 X=26, Y=03 X=03, Y=26 X=06, Y=23

You have discovered a seemingly bottomless pit with impervious smooth walls. You also have an infinitely long rope and an infinitely strong anchor point, and would like to measure as deep as possible by lowering the rope into the hole. Since the rope is very special to you (it is infinite, after ...

I accidentally dropped my avatar in puzzle, and now it has puzzle all over it! Could you please help me recover my avatar?

Here is an easy riddle that I came up with. I don't expect it to take long to crack. I am warm, round, and 40 Mm long. Who/What am I?

What is the possible number which could be placed instead of X below? 843, 9615, 2721, X, 23 Here are given choices: 151, 162, 12 and 7 (this question is not credited to me)

One Sunday morning, you awake to find yourself completely alone on an infinite, flat plane. You don't remember much about the night before, other than that you may have pissed off a wizard. Next to you, you find a palette with countably infinite colors, and a note, commanding you thus: You must ...

So, you may remember that I’m a professor of Awesomeness at the prestigious Ad Hoc University! This time, I assigned my students a quiz where they have to determine how I scored a word. Once again, I overestimated their abilities and they all failed the quiz! I’m sure it can’t be impossible, righ...