Add ONLY ONE line to make the equation below true EQUATION : $5$ $+$ $5$ + $5$ = $555$ Note : Crossing the equal sign is not allowed

Entry into Fortnightly Topic Challenge #40 Out of character comment: For effect, don't open up the next spoiler until you've finished the statement before. If answering, please explain each remark. Solve the mate in 1. Please note: no-computers allowed.

An entry into the Fortnightly Topic Challenge #40. In case you aren't familiar with the rules of go, the information in the basic rules section of the Wikipedia page should be enough to solve this puzzle. Anyway, here we go: Given the following position, and this knowledge: The...

An entry in Fortnightly Topic Challenge #40: Retrograde Analysis! I can't believe it! Last night we heard a bit of fighting... but we had no idea that... our King was dead, as were my fellow Rook and Knight! Of course, the Black Kingdom must have done this, but we have no idea how. The rema...

So I notice that the hexagon rises, so it should be A or B. But beyond that, I can't figure out why one of A or B would be correct and the other would not be.

A 1-expression is a formula in which you add or multiply the number 1; in addition, parentheses are also allowed. You can create any natural number with a 1 expression. For example, 22 as follows: 1 + 1 + ((1 + 1 + 1 + 1) × (1 + 1 + 1 + 1 + 1)) = 22 This is a 1-expression with 11 times a 1 in i...

Here you see a water map of the town of Concentrië. There are eight channels that run from the central boathouse of the city in a star shape. There are three canals that lie concentric around the central boathouse. There is one-way traffic on the canals, indicated by the green arrows. ...

Here's a quickie while I work on the fourth floor of the Puzzle Dungeon. It's going to be here within the next two days, probably. Find a way to divide 12 by 2 so you get 7. There are several rules: No base systems or modular arithmetic. No adding anything to the equation (lines, grea...

public var c: = Infinity; public var w:Array = [,,                       , ]; for(i = 0; i < w.length; i++){ if(chuck(i)){ x++; } else{ break; } } trace(x); function chuck(i):Boolean{ return c > w[i]; } What does $x$ represent?

A chess maze is a kind of chess puzzle where: Only one side moves (and that side usually only has one piece). That side must capture a piece with every move. The goal is to capture all of the opposing pieces. This chess maze is special, though. White always moves. Whenever Whi...

With a group of 8 students you have set up a small business with which you help a customer every day during the holidays to clean up his computer and to redecorate it. For the next day there are 12 possible customers. Everyone must got to one customer; so 4 customers can’t be helped that day. F...

Each letter represents a digit, so what is Mucho and Poco (although who's to say?) POCO POCO POCO POCO POCO POCO POCO POCO POCO POCO POCO POCO +POCO ----- MUCHO As far as I know there's only one unique answer Puzzle courtesy of Bob High - MIT Technology R...

A man goes into a room and sits down. Suddenly his weight increases, then eventually resumes back to normal. After several hours - suddenly his weight decreases, then eventually resumes back to normal. Finally when the man exits the room, his weight is the same as when he went in. What happen...

Grandpa decides to take a multi-country tour visiting big cities First he goes to LIBYA Then to PERU Then to BAHRAIN Then to _______ Then to _______ Then to _______ Fill in the three blanks and tell me why

I don't know, but I think my opponent just may be cheating in this chess game. So, the natural thing to do is cheat right back! My plan is to put black pieces on the board so the white king is immediately checkmated. However, I need to put the pieces with the lowest total value (pawn = 1, k...

StackOverflow is celebrating it's $10^{th}$ anniversary and thus created an article on meta about it. I decided to write a simple riddle in response to their post, and figured I would also share it here for the community. Colorado is known as my cat. He's not fond of pepper in fact. ...

Inspired by this question, here's another Linux command representing a famous line: cp -a ~she ~ Which line is it?

A male bee is born from an unfertilized egg, a female bee from a fertilized egg. In other words, a male bee has only a mother, whereas a female bee has a mother and a father. How many total ancestors does a male bee have going back ten generations?

Bob: Steve is lying Steve: Bob is lying Fred: Steve is lying or Bob is lying "or" is inclusive How would I approach this question? I honestly have no idea. I was thinking of making a truth table and assuming that each of them is saying the truth once and then going through the statements, but...

So i'm walking around in London, and found the following number riddle. The rules say, that what ever pattern you find, must be true for the rows as well as the columns. The answer in level 1 is for example 33, since it follows a+b+2=c. Meaning the the third block always is sum of the two first o...

How to solve this equation by removing one element? (one element is one spatially finished item.) hint :

Inspired by this question and this question, can you guess the famous movie quote hidden in this Linux block? infant:~$ ps a | grep 13179 13179 pts/20 R 0:18 /bin/bash ./Z 13181 pts/20 S+ 0:00 grep --color=auto 13179 infant:~$ kill 13179 infant:~$ kill 13179 bash: kill: (13179) - N...