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Questions tagged [open-ended]

NOTE: This tag is currently being debated on Meta. Questions asked under this tag may not fall under the scope of the site. Please be mindful of that when asking a question. Used when the tagged puzzle is open ended to all solvers and could be "bested" at any point, if a given solver has a better solution that fulfills the askers requirements.

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26
votes
7answers
11k views

The most words that can be made by successively adding one letter to the original word?

What is the largest number of words that can be made by just adding one letter to the original word, where each iteration is a meaningful word? E.g. ...
59
votes
19answers
9k views

Growing anagrams - What is the longest possible list forming a sentence?

This is a challenge for word-puzzle lovers. It might be a bit more of a game than a puzzle, but I think it is not limitless in it's answers, so a final answer could be found (eventually). What is ...
43
votes
9answers
21k views

The Longest Word Made from Chemical Symbols [closed]

So, as you probably know, each and every element in the Periodic Table has its own unique chemical symbol, which is either one, two, or three letters long. For instance, Oxygen is represented as O and ...
20
votes
4answers
1k views

Strategy to beat the casino over the long haul

$A$ and $B$ are attempting to beat the casino again, and the rules are the same: Each round, $A$, $B$, and the casino simultaneously decide to show a $0$ or a $1$. If all three numbers match, $A$ ...
18
votes
1answer
792 views

Peaceful Encampments

This math puzzle is due to Donald Knuth (as far as I know; maybe he got it from someone else) circa 2014. Consider a plain represented by the unit square. On this plain we want to “peacefully ...
3
votes
3answers
493 views

Make a sentence with the most different uses of the same word [closed]

Background I recently stumbled across the following grammatically correct sentence: Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo. This sentence relies on the fact that the ...
-3
votes
1answer
1k views

longest sentence using only one word and variants [closed]

This is an open ended puzzle of wordplay. Here's an example of acceptable words: reed, read, read, red, etc. They are linked by either different spellings of the same pronunciation (reed and read), ...
21
votes
9answers
3k views

Riddles/puzzles having answer hidden in the question? [closed]

Can you give any example of riddles or puzzles in which the answers are someway "cleverly hidden" inside the question? I think that such examples are more common in word-related riddles, but maybe ...
18
votes
5answers
1k views

‘‘Loopy’’ C loop

What is the smallest number of non-space characters that can be added in order to change the following code into a complete C program that prints  ...
9
votes
2answers
627 views

MathJax exposed

  WARNING   $ \color{red}{\boxed{\boxed{ \sf ~~{ \large N \, S \, F \, P \rlap{\small P\&CG~SE} }~~~ \huge\raise-.2ex\...
7
votes
3answers
784 views

Starring MathJax

Twinkle, Twinkle, little star... Having enjoyed @Humn's recent MathJax puzzles (MathJax exposed and MathJax re-flex), I decided to contribute some of my own. This one is a classic $\rm\TeX$ exercise,...
9
votes
3answers
368 views

Unreflected infinitely simple polygon reflexivity

(This was retrofitted to more tightly match a surprise solution and to allow for another puzzle with the original intent.)                   &...
6
votes
2answers
504 views

MathJax re flex

MathJax mirror on the wall, what is the fairest code of all? Let’s find the minimal replacement for (replace this line) in the following MathJax code ...
3
votes
1answer
460 views

Infinitely simple polygon solipsism

           Solipsism — The self is all that can be known to exist. Above is a simple polygonal region divided into infinitely many different-...
22
votes
6answers
3k views

From Puzzling to StackExchange

This is a variation of a game I used to play with my friends in my childhood. You are given a starting word, and using the following operations, you have to reach the target word. The solution that ...
11
votes
11answers
4k views

Longest sentence with each letter repeated n times

Inspiration: This question was inspired by Word sets with no repeating letters Rules: Sentences can be of any length. Every letter used in this sentence, must be used n times. n can be any number. ...
15
votes
8answers
6k views

Longest Word With *Only* Repeating Character Pairs

Inspired by and Opposite of: Longest Word without repeating character-pairs The challenge is to find an English word in which every character pair appears at least twice. ("Word" does not include ...
7
votes
1answer
530 views

Lights in the Dungeon: Five by Five

This is the third in a series Lights in the Dungeon puzzles. previous (2nd) <-- | --> next (4th) You are practically skipping as you leave the four by four dungeon. This has been pretty easy so ...
4
votes
1answer
235 views

The Autonumerigram Challenge [duplicate]

Some phrases both refer to a number, n, and are comprised of n alphabetic characters. I call any such phrase an autonumerigram. For example, four has 4 letters seven plus seven has 14 letters ...
27
votes
18answers
16k views

Don't settle for a billion [duplicate]

While Artur is willing to settle for a billion, I'd like a much bigger return on my two matchstick investment. Moving only two matchsticks, what is the largest number that can be created from the ...
13
votes
6answers
3k views

Can you solve those laser puzzles? (puzzles created by the community) [closed]

So, I was bored and I made a small game for this site! In this game the user who solves the previous puzzle gets to create the next one and they will always be more complex. Website link and string ...
5
votes
8answers
3k views

Longest Word without repeating character-pairs

What's the longest English word that doesn't contain the same two letters in a row more than once? Good word : too contains to ...
21
votes
9answers
2k views

Word Tank-chain-wheel Challenge

My niece gave me this word wheels challenges the other day and I comes up with an alternative. Here's how this challenge works: Find a word that can form another word by moving its first letter ...
13
votes
14answers
4k views

Shortest sentence with two auto-antonyms

You have to use two words that are each their own opposite (auto-antonyms, contronyms, contranyms or whatever you want to call it) in the same sentence. This means that each of the two words in used ...
10
votes
11answers
12k views

Infinitely long loaf of Bread [closed]

You are visiting your old friend Mike at Infinitely's Baking Shop. Just as you arrived, he was taking out a fresh, infinitely long loaf of bread. Both of its ends extend infinitely long in a ...
8
votes
3answers
2k views

Infinite choice question

The assertions in the following infinite list are all the same, true or false.       $~\vdots$   T$~~$F $~~$ I have a black Model T.   T$~~$F $~~$ I have a black ...
6
votes
2answers
838 views

No ordinary magic square part 2. How many solutions are there?

Same rules as last time except this time count or calculate the number of possible solutions! No ordinary magic square Place 1-9 in the squares below in a manner such that none of the columns, rows ...
20
votes
8answers
4k views

Craft the longest Scrabble sentence

This is another challenge along the same vein as similar challenges that have shown up on this site, requiring the puzzle to craft the longest possible sentence given a specific requirement. What is ...
12
votes
2answers
528 views

KenKen Zen: A journey begins

Let us shy away from the materialistic opulence of 361- cell KenKen layouts (−9 to +9, squared).  Let us contemplate a modest KenKen journey, unburdened by gratuitously ...
11
votes
7answers
3k views

Longest arithmetic expression where the answer is equal to the number of letters

You can use any mathematical operations represented by English words. These English words must be found in a commonly used dictionary. Spaces are neither letters nor words. You can not use the same ...
7
votes
2answers
550 views

MathJax: ones and zeros

Do or do not, there is no try.     — Yoda Here is another MathJax puzzle. The Starring MathJax puzzle involved handling numbers in MathJax, even though there are no count registers or ...
5
votes
7answers
1k views

What is the smallest positive number on an 8-segment array? (no repeats) [closed]

You are provided with the 8-segment array in the picture together with all the necessary electronics to make any combination of lit segments you want. Fillable version for graphics. http://i.stack....
4
votes
1answer
500 views

Connecting 3 circular power timers to lights so that they turn for one day on Christmas

My friend gave a question to me. I am not sure if it is an original puzzle, but he has 2 lines of Christmas lights and 3 circular timers with 96 switches apiece. Each switch turns on power for 15 ...
17
votes
5answers
2k views

Second-rate spelling

Find the longest word which can be spelled with the second letters of a group words in alphabetical order. An example with incomprehensible (16 letters): a...
10
votes
1answer
663 views

Dragons: Myth or MathJax?

Ever use MathJax to display mathematical expressions?   Expressions related to fractals? Ever used it to display fractals themselves?!   The time has come. These fractals are based on the ...
6
votes
2answers
233 views

Anagrammatical substrings

Inspired by this challenge, I have a similar, with stricter rules. Find a word that can be decomposed into several other words (more than one). Those words are not allowed to be proper substrings of ...
1
vote
4answers
659 views

Find the longest arithmetic expression with value equal to number of letters in its english representation

The expression twenty minus five has 15 letters (we ignore spaces) and also has the arithmetic value of 15. You can use standard math constants, operators and ...
1
vote
0answers
588 views

Woody words, tinny words [closed]

Note: There are some rude words in this question. There's an implicit puzzle in posed in this classic Monty Python sketch (you can also ready the script online). Various words are described as ...
1
vote
5answers
2k views

Longest *Sentence* With Only Repeating Character Pairs

BACKGROUND I asked a question about words: Longest Word With *Only* Repeating Character Pairs The goal was to find a word where every character pair was repeated at least once. This was vulnerable ...
-10
votes
2answers
494 views

Longest $Scramble Sentence$? [closed]

Before we begin, allow me to define what I call a Scramble Sentence, A Scramble Sentence is a grammatically correct sentence, where at least 1 other permutation, of the letters in the sentence, ...