# All Questions

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### The New Mega-Splitter™: What's Next?

Here we have the great pyramid. The brand new 50-50, Out-to-In Mega-Splitter™. Fill in the question marks with the next numbers! All the hints you should need are in the question!
79 views

### Combinations on superimposed latin squares

Let's have two latin squares. When we superimpose them we obtain a 6x6 superimposed square as shown in the diagram. By visual inspection we see this contains 15 combinations and their repetitions ...
175 views

### 7-QWERTY-distance words

My previous puzzle The QWERTY-shortest word was solved nearly instantly by the effective puzzling community. I also believe it is because the main parameter of the puzzle 4.7 was not perferectly set. ...
372 views

### What do “(מ)” and “(ש)” mean in an Israeli cryptic?

I was looking at the Hebrew cryptic crosswords in a recent copy of the Israel newspaper ידיעות אחרונות, and I noticed that some of the clues had "(מ)" or "(ש)" — or sometimes both —...
456 views

### Paying bills in Alphagonia

In the Kingdom of Alphagonia, where the national currency is the Alpha, banknotes are available in all whole-number denominations of alphas: 1, 2, 3,... a) What is the least number of such notes a ...
169 views

### The Case of the Poisoned Poet

I was in my office, trying to officiate a disagreement between Misters Jack Daniels and Jim Beam, when the dame walked in. She wore a slinky dress and glasses so dark all I could see in them was the ...
191 views

### Lasers: Cross through the bridges (Level 3)

Previous Level:- Lasers: The Reflection (Level 2) Rules : There will be lasers which are shaped like an arrow. The arrows pointing in the respective direction shows where the laser goes and the ...
380 views

### Please Don't Flag This Question

An entry in Fortnightly Topic Challenge #42: Wordless Connecting Walls Today, I received a rather peculiar mail from L.B.G. (Low-Budget Gladys), Glady's cousin, thrice removed (and aunt to the ...
190 views

### Let's Play! - a Scandi Drama

This is an original question. Russ and Kess are chatting. Russ says he saw Kess cracking away on his computer and wondered "what is the significance of 23986?". Kess said "it might make ...
126 views

The poor gingerbread men want to survive to Xmas (they don't mind being eaten afterwards). If at least one of them doesn't guess his hat correctly, they will all be cruelly eaten before Xmas. This is ...
254 views

### Parallel Trees On The Grass

Let the picture speak for itself and try to find the correct height of the tree marked with "?". Hint Hint2 Strong hint
248 views

### How to solve this Loopy puzzle efficiently with little backtracking?

I would like to solve this Loopy (Cairo) puzzle: But I would like to do so with as little backtracking as possible. By this I mean that I want to have at most one pending guess at a time; I do not ...
64 views

### Find the missing number (HackerRank general cognitive test question)

HackerRank general cognitive test has the following question that I cannot solve: Please find the missing number: 6 8 6 2 4 2 9 7 8 9 9 8 ? 1 3 Can you help me ...
283 views

### Sergeant Sequence calls for back-up

An entry in Fortnightly Topic Challenge #42: Wordless Connecting Walls "Sequence, get in here! Your man's definitely up to something!" The mood at Headquarters was tense. Sergeant Sequence ...
216 views

### Lasers: The Reflection (Level 2)

Previous Level:- Lasers : Introduction (Level $1$) So here is my lasers level 2 continued, and I have something new, mirrors! Rules: There will be lasers which are shaped like an arrow. The arrows ...
142 views

### What the guiding guide guide

Here's a riddle I created for Puzzling: Two guardians for a guideRadiant ladies on her side.Oh back, the first preside;Herb pac the second replied.Both have notorious great pride,For id luny was cast ...
191 views

### Lasers : Introduction (Level $1$)

Lasers is a new type of puzzle I created. (Taken help from this example, The Lazy Laser Physicist: Part 2) There will more ideas to come too, and they will be a bit simple yet different. Rules : ...
264 views

### How many triangles can you obtain using the 6 vertices and center of a regular hexagon?

Let's say there is a regular hexagon with center at point O. Question 1. How many triangles can you obtain using the 6 vertices and its center? Question 2. What is the largest number of different ...
94 views

### How do you find the sum of the digits contiguous to one which is situated in a three by three table?

The problem is as follows: I am placing the numbers from 1 to 9 in the squares of a 3 x 3 board. I start by placing the numbers 1, 2, 3 and 4 as shown in the figure. For the number 5, the sum of the ...
115 views

### Which step is creaky?

The problem is as follows: Ms. Flor has a 50-step wooden staircase that allows access from the first floor to the second floor. One of the steps creaks when a person stands on it. Diego and Mike are ...
299 views

### Tetromino Nurikabe: Five Fours

I enjoy combining polyominos with grid-deductions. My current plan is to create a Pentomino Nurikabe. But that sounds hard, so I made this Tetromino Nurikabe as practice first. I think it came out ...
166 views

### Variation of 100 Prisoners' names in boxes

100 Prisoners' Names in Boxes The following puzzle is a variation of the above puzzle. Names in Boxes The names of 4 prisoners are placed in 4 wooden boxes , one name to a box, and the boxes are ...
130 views

### Teachers around a circular table - who teaches geometry?

The puzzle is as follows: In a teacher's lounge there is a circular table where the teachers eat their meals during lunch time. The teachers' names are Albert, Benny, Charles, David, Henry and Felix, ...
345 views

### Maximize my flags

You are given the next list of 48 flags. For each pair of flags that are side by side, you score 1 point per color they share as a frontier. For instance France and Finland score 1 point thanks to ...
183 views

### Puzzle regarding emptying of cup!

Initially, I have $3$ cups with infinite capacity and some prefilled amount of water(positive integers). I can do only one operation repeatedly by choosing any $2$ out of $3$. The operation is that if ...
122 views

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### Presidential Election

This puzzle was inspired by the current 2020 US presidential election. You are running for president in a country with 10 states. To win a state you must conduct more rallies than your opponent. ...
77 views

### How many different ways can you color the diagram?

This question is a continuation of this one. Here are nine squares, connected by lines. Each square must be colored, and two squares connected by a line must be colored differently. Question 1. What ...
440 views

### History is written by the Connect Wall

This is an entry for Fortnightly Topic Challenge #42: Wordless Connecting Walls. Election Day in the United States, and my daughter is taking Civics, so we're watching the returns. It occurred to me ...
552 views

### Solve this algebraic equation

Wait what? Is there any equation?
551 views

### Chain Puzzle: Tabletop Games #7 - Maze

This is the seventh Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or ...
175 views

### Fewest number of weighings to check if coins are correctly labelled

This is inspired by the following question over at Computer Science Stack Exchange: Information-theoretic limits for a weighing puzzle You are given 11 coins with labels 1, 2, 3, ... up to 11. You ...
845 views

Try figure out what the answer is by looking at the image below. The answer is nine letters long.
182 views

### What is so unique about these four numbers?

These four numbers look like four ordinary numbers. But I found something unique about these four that I may be only true for one other set of numbers-- unless you raise the bar-may be. So what is ...