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Top new questions this week:

This new puzzle type needs a name {EXTREME EDITION}

A companion puzzle to the 'This new puzzle type needs a name' series, and inspired in part by @JeremyDover's answer to a recent question. Usually, puzzles in this series comprise a mash-up of two ...

enigmatic-puzzle grid-deduction nonogram reverse-puzzling slitherlink  
asked by Stiv 25 votes
answered by Deusovi 12 votes

Painting a chessboard

On the following chessboard every white square meets at least two red squares. Let's paint a new chessboard so that every white square meets exactly two red square. Every square should be painted ...

checkerboard  
asked by P.-S. Park 19 votes
answered by Bass 15 votes

Pentominous - Niftily

This is a Pentominous puzzle. Rules of Pentominous: Dissect the grid into regions of 5 cells each. No two regions of the same shape can be adjacent (but they may touch at a corner). Rotations and ...

logical-deduction grid-deduction  
asked by Deusovi 17 votes
answered by Reinier 11 votes

Lap Theory Optimal Betting Game

Three prisoners are seated at a table. Each of them has a mobile phone on their lap, and they are not allowed to look at anyone else’s phone (and obviously no other form of communication is allowed). ...

strategy probability game-theory  
asked by happystar 16 votes
answered by Albert.Lang 8 votes

Renegade, epitasis, and then what?

Complete this finite convoluted sequence of words renegade, epitasis, nihilist, etiolate, gallinae, ...

word word-sequence  
asked by Florian F 15 votes
answered by Gareth McCaughan 14 votes

Pentominous - P is for…

This is a Pentominous puzzle. Rules of Pentominous: Dissect the grid into regions of 5 cells each. No two regions of the same shape can be adjacent (but they may touch at a corner). Rotations and ...

logical-deduction grid-deduction  
asked by Deusovi 13 votes
answered by Graylocke 12 votes

What should I do with these emails?

I've been sent a bunch of very odd emails recently, starting on Monday and sent daily until last Thursday. I'm not 100% sure what they mean or why I am being sent them, but perhaps you could help me. ...

enigmatic-puzzle story steganography  
asked by Beastly Gerbil 12 votes
answered by Deusovi 13 votes

Greatest hits from previous weeks:

Is this Tetris puzzle solvable?

As a birthday present last year, I received some fridge magnets. They didn't come as a puzzle, so I don't know if they have a solution, but I made a puzzle out of them anyway. The magnets are ...

tiling polyomino tetris  
asked by James Webster 252 votes
answered by Tryth 356 votes

How did the police know?

One night, a man receives a call from the police. The police tell the man that his wife was robbed, murdered, and her body dumped in a remote location, and that he should reach the crime scene as soon ...

logical-deduction story mystery situation  
asked by Aggie Kidd 41 votes
answered by A.D. 82 votes

My prefix is food, my suffix is rude

I thought of this riddle myself. Feedback is appreciated. My prefix is food. My suffix is rude. My infix comes in rounds. I keep you off the ground. What am I?

riddle  
asked by Riley 216 votes

How to solve this IQ test puzzle with arrows and pied squares?

What is correct answer for this IQ task and why?

logical-deduction pattern  
asked by klm123 17 votes
answered by klm123 23 votes

A short, brutal riddle

Left alone, I'm a word with five letters. I'm honest and fair, I'll admit. Rearranged, I'm of no use to trains. Again, and I'm an overt place, warm and well lit. What am I?

riddle word rhyme  
asked by Roland 511 votes
answered by NeedAName 558 votes

Why is hell equal to 114.3 metres?

Well, the title says it all really. $$\text{hell} = 114.3\; \text{metres}$$ Why is this the case?

lateral-thinking  
asked by JDL 32 votes
answered by hexomino 47 votes

Make a square with matchsticks!

After the previous mat(c)h-stick puzzle, this one is relatively old. Move only one matchstick to make a square.

matches  
asked by ABcDexter 37 votes
answered by rgthree 49 votes

Can you answer these questions?

A robot moving on a grid. Part 2

This is an extension of the discussion A robot is placed on a grid point. At each move the robot must take three steps along the edge of the grid. After each step the robot must turn right. Lengths of ...

mathematics combinatorics grid-deduction graph-theory  
asked by Nick 1 vote

Are you guys ready for a QUESTion?

Chase me and my feet are not slow Catch me then skywards I go What am I? Hint:

riddle word knowledge  
asked by Deepthinker101 1 vote
answered by Ak19 0 votes

Is there a sudoku app where the hint identifies the squares/logic to use to solve the next step?

I have an app that has different levels of sudoku puzzles and I'm trying to learn to solve Expert. The app I'm using has a hint function, but all it does is fill in the correct answer in a selected ...

sudoku  
asked by Kim 1 vote
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