The Programming Language Quiz

Congratulations to Dennis who won both the cops' and the robbers' challenge! Calvin's Hobbies has already delivered on his promise and wrote this challenge for Dennis for winning the robbers' challenge.

Notice: This challenge is closed for further cop answers as of 2015-09-01 02:00:00 UTC. Any new answers posted will not be eligible for winning and will not count towards the robbers' scores if cracked. However, you may still post new answers for the other users' enjoyment, so that there are still some puzzles available for future visitors. These new answers are included in the "Vulnerable Cops" section of the leaderboard and their non-competing status is marked separately.

Welcome to the Cops-and-Robbers edition of The Hello World Quiz! (If you've never played the quiz, feel free to try it out for a minute or 30. You don't need to have played it for this challenge though.)

The Cops' Challenge

1. Choose a programming language. Valid languages must have either an English Wikipedia article, an esolangs article or a Rosetta Code article at the time this challenge was posted (note that the linked lists are not necessarily complete because they are curated manually). They must also satisfy our usual standards for programming languages, so things like HQ9+ are out. Lastly, there must be a free (as in beer) interpreter or compiler available for the language (at the time this challenge was posted).
2. Write a Hello World program. That is, write a full program in the chosen language which prints Hello, World! (exactly like that, i.e. this exact byte stream) and optionally a single trailing newline to STDOUT or closest alternative.

You must not assume a REPL environment, existing boilerplate code, or non-standard compiler/interpreter flags. The program must be in the form of one or more source files (to rule out quirky languages like Folders) and must fit into your answer in full (so it must not be longer than 30,000 characters) - this shouldn't be an issue for any serious submission.

If your code contains bytes outside the printable ASCII range, please include a pastebin or hex dump to make sure your code is actually testable.

The program must terminate within 1 minute on a typical desktop PC.

That's it. The catch is that you want to obfuscate your code such that it's not obvious which language you picked. Also note that you don't want your code to accidentally be a valid Hello World program in any other language, although I expect that to be unlikely for sufficiently obfuscated programs.

You must not under any circumstances edit the source code of your submission once posted (as this may invalidate a robbers' active attempts at cracking your answer). So make sure that you golf it as well as you can (or dare) before posting. If you realise that your answer does not work after posting it, simply delete your answer and post a fixed version if you want to.

If no one finds a language your code is valid in for 7 days, you may reveal the chosen language (ideally with an explanation for your obfuscated code), which will make your answer safe. Note that your submission can still be cracked until you reveal the language.

The shortest safe submission (in bytes) wins.

Formatting

(Feel free to skip this section and read The Robbers' Challenge if you're not planning to participate as a cop right now.)

At the bottom of this post, you'll find a Stack Snippet which generates leaderboards as well as a list of submissions which can still be cracked. For the snippet to work, it is important that you include a certain header in your answer:

• New answers should include a header like

# ???, [N] bytes


where [N] is the size of your code in bytes and ??? should appear literally.

• If the answer is not cracked for 7 days and you want to make your answer safe by revealing the language, simply replace the ???, e.g.

# Ruby, [N] bytes


Feel free to have the language name link to a relevant website like an esolangs page or a GitHub repository. The link will then be displayed in the leaderboard.

• If another user successfully cracked your submission (see below), please also add the language, along with a notice like

# Ruby, [N] bytes, cracked by [user]


where [user] is the name of the user who submitted the first valid crack. If the language used in the crack is different from the one you intended, I'd recommend using the robbers' guess and mentioning in the answer that you intended it to be something else. Feel free to make the user name a link to their profile page.

The Robbers' Challenge

1. Find a vulnerable answer. That is an answer, which hasn't been cracked yet and which isn't safe yet.
2. Crack it by figuring out its language. That is, find any language in which the given program is a valid Hello World program (subject to the rules outlined in The Cops' Challenge above). It doesn't matter if this is the language the cop intended.

If you've found such a language, leave a comment with the language's name. If possible, you should include a link to an online interpreter, showing that the code actually works in that language as required.

Every user only gets one guess per answer. You must not crack your own answer (obviously...).

The user who cracked the largest number of answers wins the robbers' challenge. Ties are broken by the sum of bytes of cracked answers (more is better).

Because the robbers' challenge is held exclusively in comments, there won't be any reputation incentive for the robbers. However, the Grand Master of Challenge Writing, Calvin's Hobbies, has kindly offered to write a challenge about the user who wins the robbers' challenge!

Challenge Dashboard

The Stack Snippet below generates leaderboards for the cops and robbers and will also list all answers which can still be cracked. Let me know if anything appears not to be working properly, and I'll try to fix it as soon as possible. If you can think of additional features which would make the dashboard more useful, leave a comment as well.

/* Configuration */

var QUESTION_ID = 54807; // Obtain this from the url
// It will be like http://XYZ.stackexchange.com/questions/QUESTION_ID/... on any question page
var ANSWER_FILTER = "!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe";
var COMMENT_FILTER = "!)Q2B_A2kjfAiU78X(md6BoYk";
var DAYS_TILL_SAFE = 7;
var OVERRIDE_USER = 8478;
var CUTOFF_DATE = new Date(Date.UTC(2015, 8, 1, 2));

var MS_TILL_SAFE = DAYS_TILL_SAFE * 24 * 60 * 60 * 1000;

/* App */

// Must load over https (this comment is because I need to change 6+ chars)
return "https://api.stackexchange.com/2.2/questions/" +  QUESTION_ID + "/answers?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + ANSWER_FILTER;
}

function commentUrl(index, answers) {
return "https://api.stackexchange.com/2.2/answers/" + answers.join(';') + "/comments?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + COMMENT_FILTER;
}

jQuery.ajax({
method: "get",
dataType: "jsonp",
crossDomain: true,
success: function (data) {
data.items.forEach(function(a) {
var id = +a.share_link.match(/\d+/);
});
if (!data.has_more) more_answers = false;
comment_page = 1;
}
});
}

jQuery.ajax({
method: "get",
dataType: "jsonp",
crossDomain: true,
success: function (data) {
data.items.forEach(function(c) {
if (c.owner.user_id === OVERRIDE_USER)
});
else process();
}
});
}

var VULNERABLE_REG = /<h\d>[?]{3},[^\n\d,]*(\d+)[^\n,]*<\/h\d>/;
var SAFE_REG = /<h\d>\s*([^\n,]*[^\s,]),[^\n\d,]*(\d+)[^\n,]*<\/h\d>/;
var CRACKED_REG = /<h\d>\s*([^\n,]*[^\s,]),[^\n\d,]*(\d+)[^\n,]*,\s*cracked\s*by\s*(.*[^\s<])<\/h\d>/i;
var OVERRIDE_REG = /^Override\s*header:\s*/i;

function getAuthorName(a) {
return a.owner.display_name;
}

function process() {
var vulnerable = [];
var cops = [];
var robbers_hash = {};

var now = Date.now();

var body = a.body;
if(OVERRIDE_REG.test(c.body))
body = '<h1>' + c.body.replace(OVERRIDE_REG, '') + '</h1>';
});
var match;
if (VULNERABLE_REG.test(body)) {
vulnerable.push({
user: getAuthorName(a),
size: +body.match(VULNERABLE_REG)[1],
time_left: (a.creation_date*1000 > CUTOFF_DATE) ? Infinity : MS_TILL_SAFE - (now - a.creation_date*1000),
});
} else if (SAFE_REG.test(body)) {
if (a.creation_date*1000 < CUTOFF_DATE) {
match = body.match(SAFE_REG);
cops.push({
user: getAuthorName(a),
size: +match[2],
language: match[1],
});
}
} else if (CRACKED_REG.test(body)) {
if (a.creation_date*1000 < CUTOFF_DATE) {
match = body.match(CRACKED_REG);
var language = match[1];
var size = +match[2];
var user = match[3];
if (/<a/.test(user)) user = jQuery(user).text();
var robber = robbers_hash[user] || {
user: user,
cracks: 0,
total_size: 0,
languages: [],
};
++robber.cracks;
robber.total_size += size;
robber.languages.push({
language: language,
});
robbers_hash[user] = robber;
}
}
})

console.log(vulnerable);
console.log(cops);
console.log(robbers_hash);

vulnerable.sort(function (a, b) {
var aB = a.time_left,
bB = b.time_left;
return aB - bB
});

vulnerable.forEach(function (a) {
var answer = jQuery("#vulnerable-template").html();
var time = a.time_left;
var time_string = "";
if (time == Infinity)
time_string = "Answer is not competing";
else if (time > 0) {
time_string += ((time / (1000 * 60 * 60 * 24))|0) + "d ";
time %= 1000 * 60 * 60 * 24;
time_string += ((time / (1000 * 60 * 60))|0) + "h ";
time %= 1000 * 60 * 60;
time_string += ((time / (1000 * 60))|0) + "m ";
time %= 1000 * 60;
time_string += ((time / (1000))|0) + "s";
}
else
time_string = "Cop may reveal language!";

.replace("{{SIZE}}", a.size)
.replace("{{TIME}}", time_string)
.replace("{{TIME}}", a.time_left)
.replace("{{HUE}}", a.time_left <= 0 ? 0 : a.time_left == Infinity ? 160 : a.time_left/MS_TILL_SAFE*80+40)

});

cops.sort(function (a, b) {
var aB = a.size,
bB = b.size;
return aB - bB
});

var place = 1;
var lastSize = null;
var lastPlace = 1;
cops.forEach(function (a) {
var answer = jQuery("#cops-template").html();
var size = a.size;
if (size != lastSize)
lastPlace = place;
lastSize = size;
++place;
.replace("{{NAME}}", a.user)
.replace("{{LANGUAGE}}", a.language)
.replace("{{SIZE}}", a.size)

});

var robbers = [];
for (var r in robbers_hash)
if (robbers_hash.hasOwnProperty(r))
robbers.push(robbers_hash[r]);

robbers.sort(function (a, b) {
var aB = a.cracks,
bB = b.cracks,
aC = a.total_size,
bC = b.total_size;
return (bB - aB) || (bC - aC);
});

place = 1;
var lastCracks = null;
lastSize = null;
lastPlace = 1;
robbers.forEach(function (a) {
var answer = jQuery("#robbers-template").html();
var cracks = a.cracks;
var size = a.total_size;
if (size != lastSize || cracks != lastCracks)
lastPlace = place;
lastSize = size;
lastCracks = cracks;
++place;
var languages = "";
var first = true;
a.languages.forEach(function (l) {
if (!first) {
languages += ", ";
}
first = false;
var lang = l.language;
if (/<a/.test(lang)) lang = jQuery(l.language).text();
languages += '<a href="' + l.link + '">' + lang + '</a>';
});
.replace("{{NAME}}", a.user)
.replace("{{CRACKS}}", a.cracks)
.replace("{{TOTAL_SIZE}}", a.total_size)
.replace("{{LANGUAGES}}", languages);

});
}
body { text-align: left !important}

#vulnerable-cops {
width: 600px;
}

width: 600px;
}

width: 600px;
}

font-weight: bold;
}

table td {
}

.time-ms {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="//cdn.sstatic.net/codegolf/all.css?v=83c949450c8b">
<div id="vulnerable-cops">
<h2>Vulnerable Cops</h2>
<table class="vulnerable-cops">
<tr><td>User</td><td>Size</td><td>Time Left</td></tr>
<tbody id="vulnerable">

</tbody>
</table>
</div>
<h2>Leaderboard of Safe Cops</h2>
<tr><td></td><td>User</td><td>Language</td><td>Size</td></tr>
<tbody id="cops">

</tbody>
</table>
</div>
<tbody id="robbers">

</tbody>
</table>
</div>
<table style="display: none">
<tbody id="vulnerable-template">
</tbody>
</table>
<table style="display: none">
<tbody id="cops-template">
</tbody>
</table>
<table style="display: none">
<tbody id="robbers-template">
<tr><td>{{PLACE}}</td><td>{{NAME}}</td><td>{{CRACKS}}</td><td>{{TOTAL_SIZE}}</td><td>{{LANGUAGES}}</td></tr>
</tbody>
</table>

• One minute of silence for those only capable of Piet programming. – user3819867 Aug 17 '15 at 8:20
• There goes my productivity! – Luke Aug 17 '15 at 20:30
• I think I might start debating whether or not I should start using Foo as a cuss word... "Oh, Foo! You little FOO!!" Yup, fits perfectly. – kirbyfan64sos Aug 26 '15 at 19:41

GolfScript, 87 bytes, cracked by Dennis

Outputs::Screen '$hello,$world\x21'
5735816763073854918203775149089!?; "Hello, World!"


Not the intended language... I'll try again.

• This works in GolfScript. – Dennis Aug 27 '15 at 18:04
• @Dennis Huh! The online interpreter gave An Error happened: Uncaught TypeError: Cannot read property 'a' of undefined, so I thought I was safe. – DLosc Aug 27 '15 at 18:10
• Not for me. – Dennis Aug 27 '15 at 18:10
• @Dennis I see--I used the wrong interpreter. – DLosc Aug 27 '15 at 18:12
• copy.sh's interpreter doesn't push an empty string on the stack, like the Ruby interpreter does for empty input. If you prepend "", it works there as well. – Dennis Aug 27 '15 at 18:15

Golunar, 123 bytes, cracked by jimmy23013

849929103018908538648390429242340026551748645051119016413509773663323023383923836750829562877191329081951928547062965994756


Not 100% sure if this qualifies, but could be fun nonetheless :P

Starting with a Brainfuck program,

++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++++++++++++++.------------.<<+++++++++++++++.>.+++.------.--------.>+.>.


prepend a 1, and convert the commands into binary as follows:

>   000
<   001
+   010
-   011
.   100
,   101
[   110
]   111


Yielding:

1010010010010010010010010010010110000010010010010010010010000010010010010010010010010010010000010010010000010001001001001011111000010010100000010100010010010010010010010100100010010010100000010010010010010010010010010010010010010010100011011011011011011011011011011011011100001001010010010010010010010010010010010010010010010100000100010010010100011011011011011011100011011011011011011011011100000010100000100


Convert to decimal:

849929103018908538648390429242340026551748645051119016413509773663323023383923836750829562877191329081951928547062965994756

• This is Golunar. – jimmy23013 Aug 27 '15 at 20:08
• Lol. Well so much for that :P – Fongoid Aug 27 '15 at 20:12

J--, 56 bytes, cracked by Dennis

main{if(a!=new String[]{"foo"}){echo("Hello, World!");}}

• Without the class, this would work in J--. – Dennis Aug 28 '15 at 22:03

Zucchini, 163 bytes, cracked by Sp3000

=0,01.2./.0,1./.3.17.  /.04.17.../.5.17.: /.6.17.: /.07.17.::/.8.17: /.9.17  /.10.17...:/.11.17.::/.12.17.: /.13.17.: /.14.17.. /.15.17 ./.16.17/.19.

• Blind guess: is this Zucchini? – Sp3000 Aug 29 '15 at 16:11
• Oh lord. Yes it is. – histocrat Aug 29 '15 at 16:42

J--, 33 Bytes, Cracked by histocrat

main{//&1
echo("Hello, World!");}

• Nice Foo protection. – Dennis Aug 27 '15 at 18:56
• This looks like it'd work in J--. – histocrat Aug 27 '15 at 21:04
• @histocrat Yeah, it is J--. I just did one in that, and I also saw that Fongoid was watching the github repository for the language, created his own branch, and then fixed a couple of bugs in the interpreter. :P – mbomb007 Aug 29 '15 at 19:34
• It was indeed histocrat. Sorry for the delay in marking it :P – Fongoid Aug 31 '15 at 14:44

IPython, 20 bytes, cracked by Dennis

!echo Hello, World!;


It wasn't supposed to be IPython... :(

• Here's to hoping it's not a polyglot... – mbomb007 Aug 28 '15 at 14:26
• Is it Matlab? (I do not own Matlab, so I can't test it.) – isaacg Aug 28 '15 at 18:18
• This should work in MATLAB, but I don't think there's a free interpreter. – Dennis Aug 28 '15 at 18:20
• @Dennis Right, I missed that part of the question. – isaacg Aug 28 '15 at 18:20
• The semicolon is printed in MATLAB. – feersum Aug 28 '15 at 20:02

GolfScript, 15 Bytes, cracked by Dennis

A last-minute entry!

'Hello, World!'


Works in GolfScript as shown in the online interpreter.

• Just double checking: you don't intend this to be run in a REPL environment, right? It's a full program that can be run from a file? – Martin Ender Aug 31 '15 at 19:08
• @MartinBüttner Full program run from a file. – AdmBorkBork Aug 31 '15 at 19:09
• This works in GolfScript. – Dennis Aug 31 '15 at 19:11
• Really? I tried GolfScript and it just printed the ascii char codes... – mbomb007 Aug 31 '15 at 19:11
• @Dennis I also tried GolfScript and got the same result as mbomb007. – AdmBorkBork Aug 31 '15 at 19:12

IPython, 25 bytes, cracked by Dennis

!echo Hello, World!&&exit


You guys sure do make it difficult to create a program that only works in one language and is also hard to crack.

• You're not the first one to encounter that problem. ;) – Martin Ender Aug 31 '15 at 18:52
• If this one doesn't last, it'll be too late to make another that can win. I could maybe change it one or two more ways, but I'm not sure. – mbomb007 Aug 31 '15 at 19:03
• I guess you could post a couple more variants, but of course that also gives more hints for the robbers. – Martin Ender Aug 31 '15 at 19:04
• This works in IPython. – Dennis Aug 31 '15 at 19:10
• Is there an online interpreter? I can't currently test my new programs on it. – mbomb007 Aug 31 '15 at 19:11

Smith#, 169 bytes

I hadn't quite finished this one, but since answers posted now are not competing, I thought I'd just post it anyway. It doesn't print the ! at the end. I would've kept working on it, but I wasn't able to figure out how to get the interpreter to work with code from a file in a short amount of time.

I'm fairly certain the adding the ! into the string would print it, but I'm not 100% sure.

""Hello, World"h:"0b:"<>c:1?(:=)e:"?(.)f:1?(w-o)r:"1j:
"?(o)l:1?(k+2-w+o)m:"?(d)g::=<>,h,b@=,h,b:=e,^m,h d:
<<1+c,r:=r,o,b:=r,d,b+f,j+f,m+f,l:=j,^l,b k::=?(o),=,f
w:+h,b


This program is almost "word-for-word" from the language's website, but I did change some label names and changed a couple of "s to 1s.

• As there were only two answers posted shortly after the deadline (and because neither of them can win the cops competition anyway) I decided to move the cutoff date to include the two. – Martin Ender Sep 1 '15 at 16:41

Turing Machine But Way Worse, 959 bytes cracked by Gabriel Mills

0  0 0 1  1 0 0
0  1 1 1  2 0 0
0  2 0 1  3 0 0
0  3 0 1  4 0 0
0  4 1 1  5 1 0
0  5 1 0  6 0 0
1  6 0 1  7 0 0
1  7 1 1  8 0 0
0  8 0 1  9 0 0
0  9 1 1 10 0 0
0 10 0 1 11 0 0
1 11 1 1 12 0 0
0 12 1 1 13 1 0
0 13 0 1 14 0 0
0 14 1 1 15 0 0
1 15 1 1 16 0 0
0 16 0 1 17 0 0
1 17 0 1 18 1 0
0 18 0 0 19 1 0
0 19 1 0 20 0 0
0 20 1 1 21 1 0
1 21 0 0 22 0 0
1 22 0 1 23 0 0
0 23 0 1 24 0 0
0 24 0 1 25 0 0
1 25 0 1 26 1 0
1 26 1 1 27 0 0
0 27 0 1 28 0 0
1 28 0 1 29 0 0
1 29 0 1 30 1 0
0 30 1 1 31 0 0
0 31 1 1 32 0 0
0 32 0 1 33 0 0
0 33 1 1 34 0 0
1 34 0 1 35 0 0
0 35 1 1 36 0 0
0 36 0 1 37 0 0
0 37 1 0 38 1 0
0 38 0 0 39 0 0
1 39 0 0 40 0 0
0 40 1 1 41 0 0
0 41 0 1 42 0 0
0 42 1 0 43 1 0
0 43 1 1 44 0 0
1 44 0 1 45 0 0
1 45 0 1 46 0 0
1 46 1 1 47 0 0
1 47 0 0 48 1 0
1 48 0 0 49 0 0
0 49 1 0 50 0 0
0 50 1 0 51 0 0
1 51 0 1 52 1 0
1 52 0 0 53 1 0
0 53 0 0 54 0 0
1 54 1 0 55 0 0
1 55 0 0 56 0 0
0 56 0 0 57 0 0
0 57 1 0 58 0 0
0 58 0 0 59 0 0
1 59 0 0 60 1 1

• This works in "Turing Machine But Way Worse": Try it online! – Gabriel Mills Dec 26 '18 at 20:19
• @GabrielMills Got it correct! It is my own programming language, actually, and it wasn't very popular, so I was guessing no one would get it correctly. – MilkyWay90 Dec 26 '18 at 22:40

BrainF, 30000 bytes cracked by Gabriel Mills

The source can be found at https://raw.githubusercontent.com/MilkyWay90/MilkyWay90.github.io/master/outputprog.txt

It is easy to crack if you have the time.

• I believe that this is brainfuck. – Gabriel Mills Dec 27 '18 at 5:15
• Correct! Nice job! – MilkyWay90 Dec 27 '18 at 16:04

Proton, 33 bytes, cracked by Khuldraeseth na'Barya

978651423 print("Hello, World!");


I'm not sure how easy this will be to crack. Cracked in 3 hours.

• Works in our very own HyperNeutrino's language Proton. – Khuldraeseth na'Barya Jul 1 '19 at 20:37
• @Khuldraesethna'Barya That wasn't the intended solution, but it's a solution nonetheless – MilkyWay90 Jul 1 '19 at 20:39
• Also Foo will crack it as it did so many others :) – MickyT Jul 1 '19 at 20:47
• @Khuldraesethna'Barya codegolf.stackexchange.com/a/187548/83048 which should not be cracked with Proton or Foo – MilkyWay90 Jul 1 '19 at 20:49

Proton, 49 bytes, craked by Unrelated String

def b="l";def u="e";print("H"+u+b+b+"o, World!");

• I'm guessing this wasn't the intended crack, but it works in Proton. – Unrelated String Aug 16 '19 at 4:36
• You are right, I was using Proton. – user85052 Aug 16 '19 at 4:53

???, 50 bytes

import sys
A = (Hello, World!)
sys.STDOUT.write(A)


Good Luck :)

Whitespace, 168 bytes cracked by pppery

Looks like:

  print("Hello World")



Try it to find out

• Works in Whitespace – pppery May 29 at 20:00
• Nice job! I thought that would be tough. – Ari May 29 at 20:26
• It wasn't. You threw me off for a moment, though, as I was about to say "this works in Python, and the fact that it does makes this answer so obvious it's not a serious contender and subject to deletion", before realizing it doesn't actually work in Python because of the leading whitespace. – pppery May 29 at 21:21
• Yeah, I started with no spaces and unfortunately Python doesn't care about trailing whitespace. – Ari May 30 at 0:29

???, 1628 bytes

version=NotImplemented #7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
#Hello World, version 1. 25. 15

["Hello, World!"]  #Initialize output list. However, a weird quirk makes this at most 25% likely to actually output.
["Hello, World!"]  #To increase the maximum probability, we can add more copies. This one increases the maximum to 34%.
['']               #This clears the variable to be used in the future.
exec("H='Hello, World!'"[52: 199: 1],globals()) #Create the variable we want to output (and make sure we get only the right characters).
H = "Hello, World!"#Doing things in exec() statements isn't the best idea, so we should move it outside.
backwards=" "      #Erase the "backwards" variable to make sure our output isn't printed
c=1,222, 222       #Every character (length-1 string) should be printed with as much certainty (probability as close to 1) as possible, so we want a big number here.
B="@["             #Get bounds on uppercase letters
b="{"             #Get bounds on lowercase letters
for char in H:
assert ord(char) in range(ord(b[0])+ord(B[0])) #Make sure that the output is valid (i.e. each character is less than 124 and more than 52 - 25)
assert char!=1    #The first character is invalid, and we don't want that!
print(char,end=backwards) #At this point, the character must be valid, so it is printed.
"""
50 ca 34 88 52 49 25 0a 52 38 b1 53 92 1a 43 76
43 99 34 34 25 25 52 52 44 a1 01 33 c0 b1 34 11
10 44 50 c1 44 34 1f 05 ff 44 99 35 89 53 88 01
55 75 f3 25 1e 0a d1 30 30 ab 40 d4 3c 20 04 5f
e1 31 b5 1c 40 14 3e 0d 13 43 e2 e1 f0 20 27 40
3b""" #Hex dump included for future reference.


(Note that the entire code block is part of the code.)

Try it online! (in the wrong language)

• Is it Python 3? – Ari Aug 1 at 14:47
• No, in Python 3 the output is H e l l o , W o r l d !  (because the backwards variable is a space, not the empty string). – Pizgenal Filegav Aug 1 at 16:57

???, 187 bytes

@>%>?!v(89*99*45*+\<</<<<<<<\+4*84*93*2+3*\<<</<<<<<//////////
/^<<<<<<<<\<<\<</<\:7+::3+92\\<\<<\<<\<<<\\:64*+:3+\\\\\\\\\\
.\..#/@.........."!"dlroW ,olleH'..()..]]<\$+8:*:+19///////////


Probably too easy, but I think this is a funny looking program.

• This is Lost -A – pppery Jul 15 at 16:59

Nemerle, 111 bytes, cracked by Sp3000

class Hello
{
static Main() : void
{
System.Console.WriteLine("Hello, World!");
}
}


Maybe...

• Nemerle – Sp3000 Aug 18 '15 at 12:10

Perl, 24 bytes, cracked by ProgramFOX

printf("Hello, World!");

• I think it's Perl. – ProgramFOX Aug 18 '15 at 13:39
• @ProgramFOX I intended Octave, but you get the points. – user42003 Aug 18 '15 at 13:43

F#, 75 bytes, cracked by vihan

#line 1
"Hello, " = "Goodbye "
printf("Hello, ")
#line 4
printf("world!\n")

• Is this F#? ideone.com/cTmnmy – Downgoat Aug 18 '15 at 17:31
• @vihan Yes. (this comment is long enough now) – Jwosty Aug 18 '15 at 17:33

Node.js, 38 bytes, cracked by ProgramFOX

I am going to try again.

process.stdout.write("Hello, World!");

• It's JavaScript on Node.js. – ProgramFOX Aug 19 '15 at 10:12
• nice! that wasn't hard – ooransoy Aug 19 '15 at 10:16

Gema, 20 bytes, cracked by Mauris

*=
\B=Hello, World\!

• You and manatwork should crack each other (I'm assuming they're the same language) – Sp3000 Aug 20 '15 at 2:13
• This is Gema, I think. – Lynn Aug 20 '15 at 3:46

Javascript, 23447 bytes, cracked by Dennis

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• This is JavaScript. – Dennis Aug 24 '15 at 20:49
• @Dennis damn, you're too fast! – aditsu quit because SE is EVIL Aug 24 '15 at 20:50
• JSFuck, to be specific. – user42589 Aug 24 '15 at 23:41

Shoelips, 33 bytes, solved by Sp3000

(in just 15 minutes after posting :C)

( World! ) ( Hello ) concat print

• I only know of one esolang that looks like this, so I'm going to take a guess: is this Shoelips? – Sp3000 Aug 26 '15 at 11:49
• @Sp3000 Dammit, I spent more time trying to find an esolang that hadn't been mentioned than it took for someone to guess the answer. – Pharap Aug 26 '15 at 12:00
• Don't worry, I just have a small list of languages that I thought looked like suspiciously good cop candidates :P – Sp3000 Aug 26 '15 at 12:04
• (also, keywords like concat are a giveaway if the spec is searchable on esolang wiki) – Sp3000 Aug 26 '15 at 12:05

Fish, 156 bytes, cracked by jimmy23013

CURSE YOU SHELLS!!

Now guarded against Foo and Bash...

#ifndef __linux
#include "x.h"
#define X/*\
a=1 set -e
+++++++++++++++++++++_+++++++++++++....Hello World!?:Q:
#endif
echo "Hello, World!"
int m(){}

• Works in fish (the shell, not ><>) then. – jimmy23013 Aug 26 '15 at 19:22
• @jimmy23013 NOOOOOOOOOO!!!!! sigh Back to the immunity drawing board... – kirbyfan64sos Aug 26 '15 at 19:25

><>, 79 bytes, cracked by randomra

!x"H"o!x"e"o!x"l"o!x"l"o!x"o"o!x","o!x" "o!x"W"o!x"o"o!x"r"o!x"l"o!x"d"o!x"!"o;

• This prints hello, world! in ><> which is not exactly the correct output (Hello, World!). – randomra Aug 29 '15 at 18:00
• @randomra It was meant to be ><>, I didn't notice that I left those lowercase. – DanTheMan Aug 29 '15 at 18:02

Foo, 28 bytes, cracked by kirbyfan64sos

(printout t "Hello, World!")

• I think this is CLIPS. – ProgramFOX Aug 28 '15 at 11:47
• Nope, it's not CLIPS ! – Ahmed Abdelkafi Aug 28 '15 at 11:57
• This works in...*Foo*... – kirbyfan64sos Aug 28 '15 at 18:42
• Not Foo too :p – Ahmed Abdelkafi Aug 28 '15 at 18:46
• @AhmedAbdelkafi If it works in ANY language we can find, it's cracked. – mbomb007 Aug 28 '15 at 21:38

Common Lisp, 41 bytes, cracked by georgeunix

(DEFUN HELLO ()
"Hello, World!"
)
(HELLO)


Sounds too easy for you guys ;)

• Yeah it's Common Lisp :D – Ahmed Abdelkafi Aug 28 '15 at 13:12

ksh, 21 bytes, cracked by nimi

!;echo Hello, World!;


This shouldn't work in IPython, right?

• It works in ksh – nimi Aug 31 '15 at 18:22

ksh, 20 bytes, cracked by nimi

!;echo Hello, World!


Another variation.

• It works in ksh – nimi Aug 31 '15 at 18:20
• @nimi Did the original !echo Hello, World!; work in ksh? – mbomb007 Aug 31 '15 at 18:26
• No, the original didn't work. – nimi Aug 31 '15 at 18:27
• @nimi Then why do these work? – mbomb007 Aug 31 '15 at 18:29
• ; separates commands. The original failed with !echo: not found, i.e. there's no command !echo`. – nimi Aug 31 '15 at 18:30