## 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 ...

### 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

### 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

### 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

### Renegade, epitasis, and then what?

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

word word-sequence

### 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

### 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

## 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

### 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

### 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

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

logical-deduction pattern

### 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

### 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

### 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

## 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

### 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