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14
votes
1answer
352 views

Change my first, I'm entertaining

Change my first, I'm entertaining Change my first, I can kill Change my middle, I'll be over Change my middle, I'm some bloke Change my last, I'm made of skin Change my last, ...
4
votes
1answer
170 views

Find pattern for new equation in number sequence

I saw this puzzle on this address. $3+5+7=152181$ $4+5+6=202461$ $3+4+7=122172$ $9+4+5=364518$ $8+6+8=?$ I know that first $4$ digits are $4864$. How could I find last $2$ ...
10
votes
1answer
398 views

What is a Motley Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it a Motley Word™. Use the following ...
-1
votes
1answer
48 views

lightest ball among 8 balls by 2 tries using a balance scales [duplicate]

I have 8 balls and one of them is lighter than others. How could I find that ball by 2 tries? Also I have a balance scales.
4
votes
2answers
102 views

12 balls 1 scale with 4 groups

So, we all know the famous 12 balls 1 scale riddle. It has been here repeated many times, however, the provided solutions always start with splitting the twelve balls into three groups of four. This ...
10
votes
1answer
167 views

Make $2471$ out of first seven powers of two

Can you make $2471$ using first seven powers of two: $1,2,4,8,16,32,64$, each exactly once? Only the basic operations are allowed: $+,-,\times,\div$, and parentheses $(\space)$. ...
2
votes
1answer
141 views

Sleeping Beauty Study at the Institute of Mad Science [closed]

You've been approached to assist in the furtherance of SCIENCE as a research subject at the Institute of Mad Science (local branch)! The experiment you'll be involved with is called the Sleeping ...
10
votes
2answers
193 views

Heyacrazy: Careening

This is a Heyacrazy puzzle, designed at request of testsolvers of previous puzzles who wanted to see how longer diagonals would work. Rules of Heyacrazy: Shade some cells of the grid. Shaded ...
3
votes
1answer
87 views

Alphametic puzzle, involving square and prime numbers [closed]

I have been trying puzzle solving recently and came across this problem. Any hints on how to do this? So far, I have found that N, R and F must be odd (as they are the last digit in a 5 digit prime ...
6
votes
1answer
175 views

Bravetart: Iconic America

It's been a while since I've posted, and in the spirit of my recent works, I've got a simple riddle to get back into the swing of things. As always, I hope you enjoy it, and best of luck! After the ...
-4
votes
1answer
120 views

How many cubes is this tringle made of? [closed]

can you guess? i know its a simple puzzle but lest just have fun
16
votes
1answer
709 views

What is a CirKle Word™?

This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it a CirKle Word™. Use the ...
3
votes
0answers
154 views

Trying to figure a math puzzle/equation for a surprise trip using the date [closed]

I planning a surprise trip for my husband's 40th. He is a math geek. I am not. My plan is to tell him in a series of riddles/puzzles that he needs to figure out. We are going to LA to see his ...
12
votes
2answers
587 views

Slitherlink Fillomino hybrid

This puzzle is a combination between a Slitherlink and a Fillomino. You should put a number in each square and draw a single closed loop over the grid such that the following properties are satisfied:...
10
votes
3answers
715 views

Cultural before-and-afters

Each answer to a clue will consist of the titles of two works or series put together, where the last word of the first title matches the first word of the second title. Note that the word match does ...
8
votes
3answers
373 views

So, what's to do?

It's White to move and draw the game. What must White do? You must provide proof for your claim of what's to be done by any reasonable means. This puzzle was created by Nikita M. Plaksin, and ...
23
votes
5answers
4k views

Prove your innocence

Inspired by A double-agent with a conundrum. Everything is hypothetical and while the choice of countries is important, they serve no political purpose. Tension between the US and China is rising. ...
7
votes
1answer
182 views

What are the house numbers?

Following the last question " What is the corner house number?" here is possibly a more challenging version. Fill in the missing house numbers on the map shown below. The area is occupied by math and ...
1
vote
2answers
429 views

'The Imperial triangles' trigonometry question

There is a very well-known family of right triangles in Mathematics called "The Imperial triangles". Let me explain you how they are defined: We say $T_n$ is the $n$-th Imperial triangle if these two ...
8
votes
1answer
225 views

A Strange Safari

Well, my friend told me that he's just visited a safari. Being toured around, he was very surprised how the guide could spot those animals so quickly. He took some pictures of the animals, ...
9
votes
2answers
957 views

Earth rotation discrepancy

Some time ago, I discovered that planet earth's sidereal rotation period equals 23 hours, 56 minutes, and 4.1 seconds (see for example this Wikipedia article). The sidereal rotation is the rotation of ...
18
votes
15answers
4k views

Sun setting in East! [closed]

It was a bright and sunny day during April- May(can say, peak of summer) in a country in the northern hemisphere, near to the equator. I was wandering(on foot) through this country's vast and open ...
13
votes
2answers
603 views

A journey through letters and numbers

In the year 2407476658354979366708415043923125501315337890943021769230219230892355006879909214795402102204224, as cosmopolitanism is in the air and companies are more than ever bound to ...
9
votes
2answers
168 views

Heyacrazy: “LMI”

This is a Heyacrazy puzzle, originally constructed for a test for Logic Masters India. Rules of Heyacrazy: Shade some cells of the grid. Shaded cells cannot be orthogonally adjacent; unshaded ...
20
votes
1answer
1k views

Bankers with rancor

Three colleagues at the bank are boasting to each other… Colleague 1: “Ask anybody – I’m clearly the best.” Colleague 2: “And how do you figure that?!” Colleague 1: “Well, just ...
15
votes
1answer
1k views

What brought these couples together?

Sometimes it's difficult for outsiders to understand what brings a couple together. What brings each of these couples together? ...
10
votes
1answer
123 views

A Cryptic Not-so-mini Cube

A quick teaser, enjoy! Across 3 Dance bores serious (5) 6 Light angry look (5) 11 Finally asked it to agree (5) 12 Rails - cunning homes of thieves (5) 15 Trap saner design (5) 16 Kingdom with real ...
8
votes
1answer
156 views

Heyacrazy: Forks

This is a Heyacrazy puzzle. Rules of Heyacrazy: Shade some cells of the grid. Shaded cells cannot be orthogonally adjacent; unshaded cells must be orthogonally connected. When the puzzle is ...
16
votes
6answers
4k views

Which household object drew this pattern?

In my home is a common household object. I securely attached a marking pen to some point on the household object, and I placed a sheet of graph paper next to the pen, so the paper would not move. I ...
6
votes
1answer
107 views

Ambitious Puzzler's Masyu

Contrary to the lazy puzzler, the creator of this masyu is too ambitious that he adds not only one but two extra stones, so the puzzle is unsolvable. Finish his job for him by removing those ...
26
votes
1answer
1k views

Three Singles in Three Clubs

These three belong to three different clubs. First one, very popular, is singles only club. It is closed for new membership. Second one, very useful, is for singles and couples. It is open ...
5
votes
1answer
255 views

map 5 unequal ranges to id

This is actually coming from a business place, but it's all about being able to do math tricks, and that's why I'm posting here. I want to implement the following function: ...
8
votes
2answers
195 views

A song from a play

I went to a play recently. Immediately after the intermission, some cast members sang this short (and terribly written) song: This treatise we sing on this section of stage is not so long as to ...
6
votes
1answer
210 views

What is an Independent Word™?

This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it an Independent Word™. Use ...
13
votes
1answer
650 views

Heyacrazy: Crosses

This is a Heyacrazy puzzle. Heyacrazy is an original genre, inspired by the "two border" rule of Heyawake and Heyawacky. Rules of Heyacrazy: Shade some cells of the grid. Shaded cells cannot ...
3
votes
1answer
93 views

A Hearty Warm-up

Sliding-block chess puzzles have gone a little cold, so here be a hearty warm-up! ;D In the below position that I created, it Black to move, but there is a twist: the stipulation is that it is a ...
5
votes
7answers
862 views

Natural Pattern [closed]

Once, while I was traveling on a vehicle in the Caribbean, I watched a pattern form over the course of about 30 minutes. The rendering below is an approximation of that pattern from memory. The gray ...
10
votes
2answers
1k views

The economy of trapping

A queen on the center of the board has 27 possible moves. Sometimes a queen can be trapped, like in the position below. Note: This is just an example of a what a trap should be like-every possible ...
16
votes
1answer
731 views

The sound of thunder's like a whip

The sound of thunder's like a whip, one takes a stab and makes a quip; uncaps a bottle, lights a pipe, accessing files of private type; a mental crisis, break of dawn, can experts solve what'...
10
votes
1answer
350 views

Room 11: Bits and pieces of Chinese history

Credit: Brandon X. This is part of a larger riddle room puzzle. Other rooms: Room 213 You have just woken up. You recall the night before, being driven from your home to a luxurious hotel by some ...
5
votes
1answer
198 views

Uncover Lenny Fingers' street hustle

Lenny Fingers is out on the street again, hustling people with his shell games. This time, he's using words. As you walk by, Lenny grabs you with an enthusiastic smile and shows you two words side-...
21
votes
2answers
1k views

Something in the TV

There is one answer that satisfies the title, and all of the lines below. I can bow to the enemy. I am the opposite of myself. I can help you, if you want to go back. I am known for staying ...
13
votes
1answer
267 views

Bill and Dan's Journey

What is this story about? (Apologies if at the end I improperly announce the answer.) Bill and Dan bravely ventured forth, eagerly hiking towards a notorious outcrop. Traipsing through the water ...
14
votes
1answer
1k views

Stuffing in the middle

What peculiar property do all these words have in common? ...
8
votes
1answer
297 views

TechSupport Issue ID#812

User ID: 3Aq47h-20dpc8l Language: English (UK) Today I noticed a strange text file on my Windows 10 PC's Desktop called "README.txt". Curious, I opened it and it read START → 2↑ → P 3→ ↑ P 4→ P →...
9
votes
2answers
393 views

Double helix Assembly

A long chain of organic molecule will somehow snap on 3 links forming 4 shorter strings. Then realign themselves together or self-assemble to form a double helix dna strand. Like a twisted ladder with ...
5
votes
1answer
490 views

Hiker's Cabin Mystery | Pt. XV

You and the hiker walk through passageway and are surprised to find yourselves in a forest clearing. There seems to only be one path, but there is also a piece of paper nailed to a tree: ...
1
vote
2answers
166 views

Is it easier to control an unfair die than a fair die? [closed]

First of all, I am not sure if this is the right place to ask this question, I wanted to post it at the mathematics community but also wasn't too sure. I read somewhere that when dice are fair, the ...
4
votes
1answer
270 views

Can you find the next number in the following series?

Replace the question mark with the next number. 14, 1, 13, 0, 23, 21, ?
11
votes
1answer
249 views

Peterhead Codes and Ciphers Club: Weekly Challenge

This is one of the cipher-based challenges I have created for my club. This is a lengthy puzzle so feel free to post partial answers. My golden rule is that moving something that isn't glued down ...

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