Questions tagged [no-computers]

A puzzle designed to be solved without using calculators, online decoders or computer programming.

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10
votes
1answer
692 views

The old calculator v2

This is related to the question asked before: Buttons on an old non-scientific calculator are less sensitive We have chosen 5 different integer values ($a,b,c,d,e$), and written them in an ascending ...
10
votes
2answers
236 views

Missing lattes and mutually mistrustful words

It's always amusing to watch two kids who don't trust each other swap baseball cards by exchanging them at exactly the same moment. Words can be equally mistrustful about trading their letters. ...
10
votes
2answers
6k views

Find the 4-digit code!

An agent has created a 4 digit code from the result of a maths equation involving all the digits 1-9. We know where the number 3 appears in the multiplication, but not any of the other 8 digits. <...
10
votes
1answer
389 views

Bumblin' Stumblin' Rumblin' Jumblin'!

This is an entry into the Fortnightly Topic Challenge #36 Jumble® was one of my favorite puzzles growing up. They were quick and fun and relatively easy; they took just long enough to keep me ...
10
votes
2answers
679 views

The Google Earth Challenge: “A dangerous flower”

This puzzle is based on Where is it? - The Google Earth Challenge series started by Conifers This puzzle will provide a screenshot in somewhere on Google Earth, please try your best to identify where ...
10
votes
1answer
538 views

Oriental House: An original grid-deduction challenge

A different approach to an old concept of mine, Oriental House is a new grid-deduction puzzle based once again off exits and entries. The rules are as follows: Draw a path from S to F, passing ...
10
votes
1answer
209 views

Irrationality in the balance

Sensibilly -T ™ scales were out of stock, so Gramazon filled the order with a lousy Lopside® from Irreturnable Irrationals International, Inc.73205080...  How ...
10
votes
2answers
308 views

How to fill a honeymoon

        How can a honeybee visit all cells exactly once in this crescent shaped honeycomb, beginning at the bottom tip and ending at the top? The starting cell, at ...
9
votes
10answers
4k views

A Body Part inside another Body Part

In one of his silly question mood Grandpa says: " Can you name a body part that is entirely inside (within) another body part but some distance away?" Taking the clue from his last question I ...
9
votes
7answers
714 views

Recover book titles and suggest more books

I am working on a series of book-trivia puzzles. Given an excerpt from the book directly mentioning the book title, players are asked to fill in the title. Example Given the excerpt ...now we ...
9
votes
3answers
4k views

Too early in the morning to have SODA?

Each letter shown represent distinct digit...can vary from zero to nine. $COCA$, $COLA$, $SODA$ are three concatenated numbers. Figure these out from the following relation: $COCA + COLA = SODA$
9
votes
4answers
547 views

The Football Squad

The sixteen players of a football squad, wearing shirts numbered 1 to 16, have arrived in town for a tournament. At their hotel, they are assigned 16 rooms consecutively numbered. Moreover, each of ...
9
votes
3answers
582 views

Tiling a rectangle with just the Y pentomino

Inspired by this question series, which was inspired by this question. They give rise to beautiful pictures (at least in the eye of the beholder mathematician) and some nice generalizable solutions. ...
9
votes
1answer
529 views

This word with a lot of past tenses

This interesting word is full of past Starts with a past tense verb. Add a letter at the end and you have a different past tense verb. Then add more letters at the end and you get yet ...
9
votes
2answers
273 views

Word connection squares!

This puzzle is in the spirit of Word connections, but is a more elaborate version of the same idea. In each puzzle, you have a square of seven words of the following form: ...
9
votes
3answers
432 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. No looking up the solution please! Nikita M. Plaksinm ...
9
votes
1answer
428 views

Twelve Labours - #12 Pluto Pups

This puzzle is part of the ‘Twelve Labours’ series, but can be solved independently. Previous instalments can be found here: Prologue | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 It was ...
9
votes
1answer
615 views

Narcissistic cube asks who are we?

I am a five digit narcissistic cube who likes to display my root right upfront. I also have hidden it in the back of my four digit cube brother. Who are we?
9
votes
1answer
349 views

Like totally amazing interchangeable sister outfits II: The Revenge

The sisters have learned a few lessons from their recent debut. They are now ruthlessly efficient outfit-swapping machines. (You know, sort of like Valley Girl Terminators...) They can now sustain ...
9
votes
1answer
501 views

Connect the wires without setting off the bomb

You just saw a planted time bomb! Just 5 minutes are remaining until it explodes and as you are in currently in a rural area (no bomb disposal squad) and you know how bombs usually work it is up to ...
9
votes
2answers
282 views

Happy days alphametic

Every letter a decimal digit, different letters for different digits: HAPPY HAPPY HAPPY + DAYS ---------- AHEAD Which digit does each letter ...
9
votes
2answers
524 views

Missing checkmates in one

Have you ever missed a one-move checkmate and immediately realized it after making your move? If you have, you just might have what it takes to crack this problem. Let's take an example: g4 e5 ...
9
votes
1answer
300 views

Not the “SEND MORE MONEY” alphametic

There is a story that a poor college student sent a telegram with the words "SEND MORE MONEY" to his parents, asking for more money, and asking to fill in each letter with a different digit in order ...
9
votes
1answer
210 views

One to Eleven Sum to Twenty Five

From the picture shown below, deduce the missing numbers (one to eleven)... none of them repeating. Four Numbers surrounding the Five diamonds A, B, C, D, E, as well as the five numbers in the outer ...
9
votes
2answers
367 views

Looking for another partition of 100

The sum of ten, not necessarily different, positive integers is 100. If placed adequately on the vertices of this graph, two of them will be joined by a line if, and only if, they have a common ...
9
votes
2answers
198 views

An almost Shakespearian alphametic

Every letter stands for a digit in base-9 representation, different letters stand for different digits, and leading digits are always non-zero. ...
9
votes
2answers
9k views

Crack the 5 digits code

I created this "crack the code" puzzle. I hope the members here like it.
9
votes
2answers
656 views

What is the probability that all the bullets will be destroyed?

A gun shots bullets with different speed each second. The bullets form a straight line. The bullets keep their speed (not getting slower or faster). But if 2 of the bullets collide, 2 of them are ...
9
votes
1answer
288 views

H-one-one-oneycomb

        What path could a honeybee follow to fill all cells with honey, beginning and ending at the center and visiting every cell exactly once? At first the only ...
8
votes
5answers
1k views

A few word puzzles 1

Here are some short word puzzles. 1) What's a not uncommon 7 letter word containing all 5 vowels and "s" and one other consonant (not necessarily in order)? 2) What's a common one syllable word, ...
8
votes
3answers
542 views

Gambling with the leading digit of $2^n$

Your gambling friend has come to stay with you and offers to play a game with you as many times as you wish: He chooses an integer $x$ between $1$ and $9$ inclusive, and makes a wager of $\$1$ with ...
8
votes
6answers
667 views

What is the Key to Good No-Computers Puzzles?

Question What advice, strategies, keys, or elements would you suggest for creating challenging puzzles that aren't (reasonably) computer soluble? Details I'm a programmer, so I can appreciate the ...
8
votes
5answers
780 views

The distance between David and Eric

Alice and Bob are looking at each other, both turn $10$ degrees and now they both can directly see Claire. If they continue turning in their same directions before, Alice will directly able to see ...
8
votes
2answers
277 views

Hand tiling puzzle demonstrating Eisenstein triple $c^2 = a^2 -ab + b^2$

An Eisenstein triple is related to 60 degree triangles and a special case of the cosine law. But we need not worry about that except to note that a specific example of an Eisenstein triple is $7^2 = 5^...
8
votes
2answers
374 views

Scanned Magazine Comics

This drawing was sent to me by a friend a few years ago. He said it is a kind of Mystery Case File but what to find is up to me figure them out. Is there something to find here?
8
votes
2answers
445 views

Alphametic as protest #2

Riddles for all. Since my latest alphametic as protest got a good feedback but my riddle as protest did not, I decided to stick to what works and added a new alphametic as a protest for the riddle ...
8
votes
4answers
665 views

Unusual letter combinations 2

I really liked this puzzle so I made my own version of it! I'll give you an unusual set of letters which are present consicutively in one* word in the English language (and possibly its derivatives, ...
8
votes
2answers
986 views

The magic of the primes

A mathematician, a physicist, and an engineer found themselves caught in an ancient anecdote. Lacking a chemist to brew them an anecdote antidote, they fell to arguing over which of them was to be the ...
8
votes
1answer
688 views

A B C in close knit relationship.. Who are they?

Find these closely knit numbers examining their relationships. A, B, C are distinct positive integers. AB, AC are concatenated Numbers. Given: 1 / AC = 0.0BC0BC0BC...... 1 / BC = 0.0AC0AC0AC......
8
votes
3answers
357 views

How can 15 become 3?

This is not a mathematical puzzle. How can 14 become 7? 10 becomes 1, but can also become 2. 13 becomes 8, and 8 becomes 10. 6 stays as 6 under this thinking. Hint 1: Since answer was found, OP ...
8
votes
1answer
1k views

Hangman- No misses left

**** No programs allowed. You must find the answer using your own brain. **** Your hangman game allows for 9 misses, but on the 10th miss, you're hanged! You don't want to be hanged. The letters ...
8
votes
2answers
330 views

Square Spin #4: Rude Awakening

Square Spin History: #1>#2>#3>#4 New Rule This puzzle introduces a new square type: Lonely squares (Ly) Lonely squares This type of square contains a box and it is ...
8
votes
1answer
153 views

These Two Cubes are The Only Ones That Are All Pure Prime..name them

Given: CU and BBUE are concatenated Cubes with all prime digits B, C, U, E. Which are these two Unique Cubes?
8
votes
3answers
543 views

Ambiguous Grids

After six to eight weeks of waiting, your Shmikoli™ Ambiguous Grid Deduction Puzzle Set has finally arrived! You tear into the box only to discover that the instructions are missing. You shouldn't ...
8
votes
1answer
1k views

Christmas Sudoku

CHRISTMAS IS COMING!!! And to celebrate, here is a Christmas related sudoku: *A friend gave this to me and it took a long time for me to solve it. Thaks to @GentlePurpleRain for providing an updated ...
8
votes
2answers
193 views

Nebulosity alphametic

Every letter stands for a digit in decimal representation, different letters stand for different digits: ...
8
votes
3answers
297 views

Holiday cookies word attrition [humans only]

I am inspired by the story of the boy who came upon an assortment of holiday cookies beautifully arranged on a platter. The boy quietly helped himself to a cookie and artistically rearranged the ...
8
votes
1answer
138 views

A very different Alfred E. Neuman alphametic

Yesterday I posed an Alfred E. Neuman alphametic with multiplication, and today I pose an Alfred E. Neuman alphametic with division for the lovers of Mad magazine: Every letter and every question ...
8
votes
1answer
262 views

The Newest Cycle

A wonderful new chess problem has appeared lately that is most wonderful. I am here to share it with the world today. But you must solve it in order know about it’s glory! It’s White to move and ...
8
votes
1answer
169 views

Uh oh, now the boards are missing!

I found another trunk in the attic, with more of those vintage propeller games. This time, I've got propellers, but no boards. Is it possible to figure out the whole board from just the propeller? ...

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