# Questions tagged [open-ended]

OPEN-ENDED PUZZLES ARE NO LONGER IN SCOPE. Used when no answer can be guaranteed to be the last, best one. If a puzzle instead has a provably optimal solution, tag with [optimization].

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### Building a 2 mile runway on a 1x1 mile island [closed]

You have a 1-mile long x 1-mile wide island. When taking off from a flat runway, a plane requires a runway of minimum length 2 ...
28k views

### Find words with the highest proportion of a single letter [closed]

Thanks to JoeZ, pacoverflow, isaacg, Sp3000, Novarg, Ram, h34, and all those who contributed answers that have since been beaten. I've accepted JoeZ's answer since he has the most mentions on the list ...
555 views

### Bouncing Robots: Graphical Puzzle [closed]

Robots are indicated by the arrowhead shapes and the labels "r", "y", "b", "g". The label obviously corresponds to their color. The aim of the puzzle is to pick up the shapes and put them down in the ...
14k 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. ...
2k views

### I before E, except in the following sentences: [closed]

"I before E" is a common mnemonic that is taught for spelling certain English words, but this mnemonic is often wrong, as pointed out in this Language Log post. The aim of this question is ...
430 views

### What's my number? [duplicate]

I am thinking of an integer $1,2$ or $3$. You can ask me only a single question to which I can reply "Yes", "No" or "I don't know". I will be completely honest. What will you ask me to figure out what ...
2k views

### Longest alphabetical sentence [closed]

What is the longest alphabetized (by first letter) sentence you can construct? For example, consider these "words": be, a, fish, elephant, crashed, dead If this were a sentence, it would be valid:...
2k views

### English words with the most consonants, all voiced or all unvoiced [closed]

What English words containing only voiced or only unvoiced consonants contain the most? Count each consonant as many times as it appears. Note that this is a question about the sounds (phonemes) ...
309 views

### Memory Enhancement Through Numeric Imagery - What is the longest or best coherent sentence/paragraph/story you can make? [closed]

The guy who recited 20k numbers of pi by memory alone used a system where he converted numbers into consonants and then grouped words or sentences together to remember a huge amount of numbers. Here'...
5k views

### Longest sentence with each letter repeated n times [closed]

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. ...
3k views

### Pairs of anagrams where the two words sound and look very different

This is a question about pairs of anagrams capable of flavoring puzzles as memorable and surprising because the two words are so different. One of my favorite such pairs is chesty and scythe. These ...
368 views

### Object Representation [closed]

Background It isn't a common art style, but it is still done: using letters for form in pictures. Sometimes, people create art using only letters. Now, let us choose a word, i.e. Cool. 'Cool' can be ...
10k 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 the ...
6k views

### Longest Calculator Word? [closed]

Current Best; Babingtonites = 5371207621898; 13 letters We all know from fooling around with a calculator at some point in our lives, the when we turn a calculator upside down we can make words. For ...
564 views

### Shortest sentence with 2 sets of synonyms? [closed]

Current Best: 13 characters This time I'm asking you guys to determine the shortest possible grammatically correct english sentence that includes 2 pairs of synonyms (different words that mean the ...
685 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 ...
4k views

### Shortest sentence with two auto-antonyms [closed]

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 ...
4k views

### Maze Generation Algorithm [closed]

You must design an algorithm for a 16x17 rectangle grid. Each "cell" is either a wall or an opening. This algorithm must achieve a maze without long hallways in 1 general direction, and must have dead ...
3k views

### Open-ended challenge: Find the longest morsagram word pair [closed]

The idea for this challenge stems from this posting on ComputerScience (beta). It is established (see above link), that Morse-code requires the 'space' between individual character to be uniquely ...
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 ...
632 views

### The Longest Word Made from Specific Chemical Symbols [closed]

So, my first question on this topic was answered fairly quickly with quite a long word, so I thought I might post a different version of the puzzle The idea this time is similar to last time: you ...
23k 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 ...