91 questions linked to/from Golf you a quine for great good!
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### Tips for Creating/Maintaining a Golfing Language

Creating a golfing language can be hard. Let's help budding golfing language creators out and provide some helpful tips on how to create one. I'm looking for tips on: The design process ...
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### What is the shortest brainfuck quine? [duplicate]

(Apart from the empty program of course) The shortest I could find was this 410 byte beauty: ...
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### Rock Paper Scissors (Sorta) Quine

Create three programs, which we'll call Rock, Paper, and Scissors. Each program must be unique, and accept input. If a program gets any input which is not one of the programs Rock, Paper or ...
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### Write a piece of code that prints out itself [duplicate]

I'm new to this site, so I don't know whether this challenge already appeared: Write a piece of source code, so that after running the code, it prints out exactly (i.e. not longer, not shorter) the ...
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### Y2K… in 2019?

It's August 10th, 2019, but your task still involves Y2K. Weird, right? Create a program that prints itself, with a two digit number appended to it. The first time you run it, it should append 00 to ...
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### Print the last, middle and first character of your code

The challenge is simple: Print the last, middle, and first character of your program's source code, in that order. The middle character is defined as follows, assuming a source length of ...
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### The anti-narcissist

The narcissist is a program which, given its own source as input, prints a truthy value and, given anything other than that, prints a falsey value. Today, we're reversing this. Create a program that, ...
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### 45 degree quine [closed]

A very simple golf this time, but should be fun to do. Challenge Output your code, but rotated 45 (or -45) degrees. E.g: lorem ipsum dolor sit amet becomes <...
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Challenge Return the full contents of your program, but inverted. How do your invert something? Well, Letters: Take the position of the letter in the alphabet, subtract from 26, and use the letter ...
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### Meta-bowling Golf

Your task is to create the shortest program (A) that outputs another program (B) with the most unique bytes, which in turn outputs the original program (A). Essentially, you are golfing one half of a ...
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### Quine outputs itself in binary

Your task, if you wish to accept it, is to write a program that outputs its own source code in the binary UTF-8 representation. Rules The source must be at least 1 byte long. Your program must not ...
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### Create a kind of quine, such that the program prints one character of itself, then two, then three and so on

Create quine variant such that the program prints its first character, then the first two, then three and so on until the whole program is printed. Example Suppose your code is ...
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### Q​u​i​n​e R​e​l​a​y​!

Quine Relay! A quine relay of order $n$ is a series of programs $P_1\dots P_n$ in distinct languages such that each program $P_i$ outputs $P_{i+1}$ and $P_n$ outputs $P_1$. For example, ...
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### Help us escape the quine factory! Put messages into quines [duplicate]

I've been enslaved in a quine factory. The other workers and I can't communicate with the outside world, we can only slave away making quines all day. The masters will reject any work that isn't a ...
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### 2 Cats in a Quine

Challenge Make two programs, A and B, which are both cat programs in the same language. When concatenated, AB (also in the same language) should be a quine. For example, suppose ...
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### Rolling Quine Dice

Create a program that outputs itself. However, if the source code is repeated n times (meaning to concatenate a copy of the source code to the end n-1 times), then there should be 1/n probability ...
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### Write a Quine Suite

We've had a lot of quine challenges, but a lot of the quine formats are similar, lets create some variance in our quines. Your task is to create a selection of programs in the same language (at least ...
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### Auto cycler quine

Make a quine but with a twist. Statement The quine prints its code but puts its first character at the end. (You can do it in reverse but include that note in your answer) The output must then be a ...
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### Build a golfing language with me

A lot of PPCG users helped with the creation of this challenge, both in chat and the Sandbox, specifically Martin Ender, AdmBorkBork, Emigna and user202729 Our community has found it necessary to ...
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In the context of quines, an intron (or payload) is a part of a quine that serves no purpose in producing output, but is still included in the data section. For example: ...
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### Self-growing code codee codeee codeeee

Write a program (or function) (let's call it P1), that when run, outputs another program P2 of the same language and exactly 1 byte longer than P1. Program P2 when run, should output a 3rd program P3 ...
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### Take a stand against long quine lines

or: Build a vertical quine Inspired by Take a stand against long lines. Your task is to build a vertical quine with as short a line length as possible. Scoring Shortest line length (excluding ...
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### Is it a substring of itself?

Given a string, return whether the string is a substring of the program's source code. Standard quine rules apply, meaning you cannot read your own source code. The length of the input is guaranteed ...
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### Tips for golfing in QBasic

What general tips do you have for golfing in QBasic? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to QBasic (e.g. "remove comments" is ...
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### Unfurling-Safe Quine

Write a proper quine containing at least one newline/linefeed whose every unfurling is either itself a proper quine or outputs the original quine. Your answer can mix and match outputting itself and ...
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### Travel Back in Quine

The challenge here is simple, and not at all about byte-count. Your job is to output the first 50 characters of the previous quine's source code, concatenated with the first 50 characters of yours ...
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### Make a base64 Quine! [duplicate]

Your challenge is to output a Base64-encoded version of your source code, and optionally a line break. You must output the correct padding, if any. Standard quine rules apply, shortest answer wins. ...
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### Interquine - Two programs that output each other in a loop

Program A outputs program B's code when run, and B outputs A's source. Requirements: Only one language across both programs Programs are different. One program that outputs itself does not qualify. ...
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### Build a Faulty XKCD Browser

Challenge Given the number of an XKCD comic, output the title text of that comic (the mouseover text). However, the program must throw an error when given the numbers ...
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### Unique is Cheap

Write a function or program that determines the cost of a given string, where the cost of each character equals the number of how many times the character has occurred up to this point in the string,...
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### Golf an Anagram Quine

In this question I asked you to guess an anagram quine based on its output. However it looks like we don't have a question asking to golf an anagram quine yet. So your task will be to make the ...
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### Alice's ordinal formatting

Introduction Alice is a 2-d language by Martin Ender which has two different execution modes, cardinal and ordinal. When the instruction pointer passes through a mirror (either ...
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### It's Anagram Quine, not just Quine!

The Task In this challenge, your task is to write a program, which takes in no input, with as many anagrams that are quine of themselves as possible. Your score will be the number of anagrams of ...
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### Rotation-safe quine

Write a proper quine whose every rotation is itself a proper quine. For example, if your source code is abcdef, then: abcdef ...
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### How many times will you have to golf a quine?

For this challenge, you must create a programme which takes an integer x and outputs its source x many times. Rules This is ...
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### Tips for golfing in 2D languages

What general tips do you have for golfing in 2 dimensional programming languages? I'm looking for tips which can be applied to code-golf problems and are specific to 2D programming languages, but not ...
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### Generating a random alphanumeric string of length N

What is the shortest way of generating a random string with a given length and with only alphanumeric characters allowed? example of a random string: with N = 9 output would be ...
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### Period 2 Reversed Quine

Your task is to write a program that outputs its own source code in reverse. However, when the reversed code is run, it should output the source code, facing the correct direction. Example Say your ...
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### Print a quine that contains the input

Task You will be given a string in the input consisting only of the characters from a to z, i.e. the input will match the regex ...
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Intro Reverse and add is as simple as it sounds, take n and add it to its digits in reverse order. (e.g. 234 + 432 = 666). If you apply this process repeatedly ...
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### Tips for writing quines

A quine is a program that produces output that's identical to the program's source code. On this website, we generally only care about proper quines (at the time of writing, the current definition is "...
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### Is this even or odd?

Note: There is not been a vanilla parity test challenge yet (There is a C/C++ one but that disallows the ability to use languages other than C/C++, and other non-vanilla ones are mostly closed too), ...
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This is a cops-and-robbers challenge the Robbers' Thread can be found here Your challenge is to write a program that outputs an anagram of its source code but not the original source code itself. ...
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### Hex Dump your Source Code

When code-golfing there will be times where you need a Hex Dump of your code, usually because you've used unprintable characters. So, why not make a program that Hex Dumps itself? The Challenge This ...
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### Draw Reutersvärd's Triangle

This impossible object is Reutersvärd's triangle: Draw your own version according to these rules: Exactly 9 cubes total Each side is made up of exactly 4 cubes The cubes appear to overlap such that ...
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### Error (or warning) quine that's also a regular quine [closed]

(Inspired by this comment on an old question.) Background An error quine (also known as a "Kimian quine") is a program which, when compiled or run, causes the compiler/interpreter/runtime to print ...
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### Fastest Mini-Flak Quine

Mini-Flak is a subset of the Brain-Flak language, where the <>, <...> and [] ...
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### Make an interweaving quine

Your task is to create a program that, when run, returns itself as output (this is known as a quine). However, this quine must, when it is copied n times, returns ...