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:

# ???, [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.

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 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;
}

}

jQuery.ajax({
method: "get",
dataType: "jsonp",
crossDomain: true,
success: function (data) {
data.items.forEach(function(a) {
});
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;

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 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 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 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>
<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>
<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

Pascal, 113 bytes, cracked by vsz

begin{
print "Hello, World!"
#/*
end}
writeln('Hello, World!')
{begin
*/
printf("Hello, World!");
/*
}end.
{//*/}


Yep, that was pretty easy :)

• It seems to be Pascal, a strange language where { } are comments. – vsz Aug 17 '15 at 21:36
• {...} is a comment? That's evil. – Dennis Aug 17 '15 at 21:39

Enema, 21 bytes, cracked by Sp3000

"!dlroW ,olleH"[DZBO]


How it works

"!dlroW ,olleH" Push those characters (including a null byte) on the stack.
[               Infinite loop:
D               Duplicate the topmost element on the stack.
Z               If it is non-zero, skip the next instruction.
B             Break out of the loop.
O             Output as a character.
]

• Well, in Microscript, this would print 0\n, after pushing a bunch of numbers onto the stack. – SuperJedi224 Aug 21 '15 at 22:57
• I believe this works in Enema – Sp3000 Aug 23 '15 at 13:03
• @Sp3000 That's correct. – Dennis Aug 23 '15 at 14:56

Dogless, 85 Bytes, cracked by Sp3000

abcdef|ghijkl|mn"op"|<$gA$me>|<$kl$dl>|<$nH$jo>|<$er>|<$cd$AW>|<$hx$fo>|$a!$i,$x $b\?  Dogless is a self-modifying language. Execution begins at the first |, and all | after the first are ignored. Everything in "double quotes" is also ignored. < is a meta instruction that executes the next instruction in the context of the source code before the IP.$ takes two arguments, and replaces the first occurence of the first letter with the second letter. > is a meta instruction that executes the next instruction in the context of the source code after the IP. (Which is always a |, which are ignored). Finally, ? reverses the entire code.

After execution is complete, dogless prints out its remaining source code, which in this case is Hello, World!

• Would this be dogless? – Sp3000 Aug 22 '15 at 23:59
• Indeed it is :) – Fongoid Aug 24 '15 at 2:43

Linotte, 34 bytes

/**"!"**/ :
"Hello, World!"!


No real obfuscation here, just relying on the low notoriety of the language and its ! print command. The non-breaking thin space provided an unusual program name (a normal space is not allowed) and the commented out "!" is obviously a FOO safeguard.

• Lol. Nice quick addition to prevent it working in Foo. – mbomb007 Aug 25 '15 at 21:05
• There seems to be a \u202f char just before the colon - is this intended? – Sp3000 Aug 25 '15 at 22:35
• @Sp3000 Absolutely. Well spotted. – Evpok Aug 25 '15 at 22:39
• In that case, just to check: are there any non-ASCII chars or unprintables in here? Stack Exchange sometimes messes with those, so I just want to make sure that it didn't. – Sp3000 Aug 25 '15 at 22:44
• @Sp3000 Nope. That's the only non-ASCII character. – Evpok Aug 25 '15 at 22:50

DB2, 20 bytes

!echo Hello, World!^


Woe is me. At least I'm learning a lot of information really quickly for this challenge.

Yay! It didn't get cracked! Considering how long I spent searching for a way to make it work only in DB2, it was worth it. I'll add more of an explanation later.

Explanation

• !echo prints text
• ^ is an escape character, but nothing follows, so it is ignored. A second carat would be necessary to print it.
• This is where I first started looking into it, though it ended up being more complex getting it to work only in DB2. I was running variations like mad.
• All my shells either print the caret or substitute it with something else. At least on my computer, this does not work in IPython. +1 for persistence. – Dennis Aug 31 '15 at 19:33
• @Dennis FINALLY! – mbomb007 Aug 31 '15 at 19:38
• Is this Cmd? It's the only thing I can think of that treats ^ specially. I'm likely wrong, though... – kirbyfan64sos Aug 31 '15 at 19:54
• @kirbyfan64sos Nope. Cmd prints More? like it wants more commands to follow, and upon finishing, declares that !echo is not recognized as a command or file. – mbomb007 Aug 31 '15 at 19:58

QBasic (QB64), 87 bytes

Should be GolfScript-proof now.

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


Nobody noticed the ? hiding in there!? ;^)

Breakdown:

• 5735816763073854918203775149089! is a line number. The ! is a type suffix that indicates single-precision numbers, but I never knew you could use it on line numbers too.
• ? is a shortcut for PRINT. The PRINT statement separates multiple expressions with ; when they should be printed with no space in between. If a ; is at the end, it suppresses the final newline. If it's at the beginning, evidently, it's legal syntax that has no effect.

The second line is solely for obfuscation and Foo protection:

• Outputs: is a label.
• The second : is a statement separator.
• Screen aka SCREEN, without arguments, apparently does nothing. (With arguments, it's used to change the screen mode for graphics and such-like.)
Update: I've just discovered that this part only works in QB64. SCREEN without arguments in QBasic 1.1 on archive.org gives an "Illegal function call" error, and the help file clearly shows it as needing at least one argument.
• ' begins a comment. Everything afterward is a red herring, which also attempts to defeat Foo via the $h part. Apparently it did its job. • I don't think too many people know QuickBasic to have noticed the ?... – kirbyfan64sos Sep 3 '15 at 18:46 • @kirbyfan64sos Martin mentioned BASIC dialects as having identical shortest "Hello, World!" programs on the "Hello, World!" question, and the VBA answer there uses ?. It may not be common knowledge, but I figured there'd be enough people who knew about it that I needed to hide it pretty well. – DLosc Sep 3 '15 at 19:41 Java, 488 bytes, cracked by Dennis \u0070\u0075\u0062\u006c\u0069\u0063 \u0063\u006c\u0061\u0073\u0073 \u002f\u002a init hello:word; \u002a\u002f Hello \u007b\u0020\u0070\u0075\u0062\u006c\u0069\u0063 \u0073\u0074\u0061\u0074\u0069\u0063 \u002f\u002a set word as exec \u002a\u002f void main(String[] a)\u007b \u0053\u0079\u0073\u0074\u0065\u006d\u002e out\u002e\u0070\u0072\u0069\u006e\u0074\u006c\u006e (\u0022\u0048\u0065\u006c\u006c\u006f \u0022+ \u002f\u002a run hello as \u002a\u002f\u0022World\u0022); \u007d\u007d  • Is it Java? (more chars) – Dennis Aug 17 '15 at 14:15 • @Dennis i hoped it will be more challanging – user902383 Aug 17 '15 at 14:18 • damn, im so sloppy i left void main:( – user902383 Aug 17 '15 at 14:19 • @user902383 The Unicode escapes are a rather well-known trick around here. ;) – Martin Ender Aug 17 '15 at 15:02 • @Luminous Unicode escapes. \u0000 to \u007F are ASCII characters. – Dennis Aug 17 '15 at 23:31 dc, 36 bytes, cracked by jimmy23013 13 37~i4A6B0CA06939989941081542909BP  • This is dc. (15 chars.) – jimmy23013 Aug 17 '15 at 18:46 • @jimmy23013 Wow, you beat me to it. Also my first guess. – PurkkaKoodari Aug 17 '15 at 18:48 • Well, that didn't last long... – Dennis Aug 17 '15 at 18:49 • How did you edit this post in grace period and leave the original in the revision history? – jimmy23013 Aug 18 '15 at 13:34 • @jimmy23013 Your comment ended the grace period. – Dennis Aug 18 '15 at 14:22 SPSS, 21 bytes, cracked by MickyT Echo "Hello, World!".  • Your code on cmd produces "Hello, World!" with the quotes, which is wrong. – Nico A Aug 17 '15 at 22:31 • (I guessed Batch, which was wrong) – Alex A. Aug 17 '15 at 22:59 • @MickyT It isn't what I had in mind. I don't have SPSS, so I have no idea if it would work. – Dennis Aug 17 '15 at 23:17 • @MickyT I've compiled GNU PSPP and it works. – Dennis Aug 17 '15 at 23:34 • @MickyT I might reuse it, so I don't want to tell right now. – Dennis Aug 17 '15 at 23:38 FALSE, 47 bytes, cracked by Sp3000 72,101,108,108,111,44,32,87,111,114,108,100,33,  • I do believe this works in FALSE – Sp3000 Aug 18 '15 at 2:06 Golfscript, 376 bytes, cracked by Peter Taylor I won't win shortest submission but I enjoy trolling a bit :) #include <iostream> #include <string> using namespace std;string 0utput("Hello, World!\n");struct my_struct{string input;};void print(string x){cout<<x;}string x="abc";int main(){cout<<"What language do you think this is?\n";my_struct M;cin>>M.input;if(M.input=="C++"||M.input=="c++"){cout<<"Haha. Guess again\n\n";main();}else print(Output);}my_struct Hello;my_struct World;  Ungolfed: #include <iostream> #include <string> using namespace std; string 0utput("Hello, World!\n"); struct my_struct{ string input; }; void print( string x ){ cout << x; } string x = "abc"; int main(){ cout << "What language do you think this is?\n"; my_struct M; cin >> M.input; if( M.input == "C++" || M.input == "c++" ){ cout << "Haha. Guess again\n\n"; main(); }else print( Output ); } my_struct Hello; my_struct World;  • Looks like it works in GolfScript. – Peter Taylor Aug 18 '15 at 11:52 • Jesus! Took you less than a minute. Nice work. – A Frayed Knot Aug 18 '15 at 11:53 PowerShell, 945 bytes, cracked by MickyT Won't win for shortest, but this was a fun diversion. Also my second submission to this particular contest, hopefully this one is a bit more obfuscated. Code: # This is a crazy-weird program [that is # > than all+others and<none -- not even # Fish -- if you can count that # -- I don't count it either # That's weird - what's this doing here?]>--.$a=66
#   These [#-#] blocks are  all-comments    [meaning    everything+nothing
#   but>    c++[and somehow not c++ even    with
#   an  Include <cstd]io>] piped    > to a
#   nothing-dot like this one .
#   Whoa    it's another    [#-#] block - wonder
#   what    [this>one+does< maybe --- nothing] Maybe>everything-.   M[a-y]be
#
#   there is a  secret+hidden [me->an-[ing in amongst
#   these   --< arrows] and >- tabs]    Can>.
#   you figure it[o-u]-t[>Withou+<  g-o-i-n-g   ca-r-a-zy?] all cooped
#   up  like a  >   less-than   dot.bracket [
$b =$a    -   22  ;   #WHOA
#WHOA]>
#   Where did +ha[+ come    from?   All out
#   of[<left    field] li>>ke   tha+    with    na<ry   a
#   warni+g]    that>   stuff is    happening  .
"Hello" +   [char]$b + " World!" #HolyCrapWTFEndOfLine #P.S.-WhatIfYouTakeASpaceToMean0AndATabToMean1LikeInWhitespace-WhatThen?.  • Wow, that's genius. Good luck to anyone who attempts! Perhaps you'll succeed (unlike me)... – ETHproductions Aug 18 '15 at 19:14 • Is it powershell? – MickyT Aug 18 '15 at 20:10 • Bah, indeed it is. ;-) I'll see if I can come up with yet another obfuscation of a PowerShell program. Three months from now, I'll write a program in python and everyone will go ballistic. ;-) – AdmBorkBork Aug 18 '15 at 20:13 Nim, 28 bytes, cracked by Mauris ("Hello,\x20".echo "World!")  Honestly not sure how hard this one is, so it'll be interesting. The \x20 is to hopefully minimise the chance of this coincidentally working in random esolangs. The usual Nim Hello, World! is echo "Hello, World!"  but Nim's syntax is pretty flexible, allowing for dot syntax. The parentheses were completely irrelevant. • This is Nim. --- – Lynn Aug 19 '15 at 2:33 • @Mauris Correct! :) – Sp3000 Aug 19 '15 at 2:38 Tiny, 37 bytes, cracked by Sp3000 Echo "Hello," and " World!". End. "!"  • Nice use of "!" to prevent this from working in Foo. :) – kirbyfan64sos Aug 19 '15 at 20:37 • I love the output in GolfScript: World! World! World!! – ETHproductions Aug 20 '15 at 16:27 • Works in Tiny. The hardest part was trying to find an interpreter, which is available here. – Sp3000 Aug 22 '15 at 23:14 • @Sp3000 After reading the esolang page, I'm not entirely sure why, but yes, it works in Tiny. – Dennis Aug 22 '15 at 23:53 Gibberish, 60 bytes, cracked by Dennis 1 fs=[Hello, World] 2 fs.seq [33] 3 fs.@-1 x i 4 fs.prigte o  I knew it was only a matter of time once Dennis posted his own Gibberish answer. How this works: Gibberish is a stack-based language with single-character instructions, except for string literals enclosed in []. When in f mode, s pops a number off the stack and skips that many characters from being interpreted, so the beginning of each line is a no-op of increasing length used for obfuscation. Whitespace is also ignored. The intent was to mimic a language that had line numbers and variable assignment (although the use of fs as my fake variable name accidentally made it look like Node.js). If we remove this obfuscation, we get [Hello, World] (push the string "Hello, World" onto the stack) eq (pop the string and print it) [33] (push the string "33" onto the stack) 1xi (convert "33" to the number 33) gt (convert 33 to its ASCII character, "!") eo (pop "!" and print it with a trailing newline)  • Is this Node JS? – Grant Davis Aug 20 '15 at 23:20 • It is not, sorry. – histocrat Aug 21 '15 at 0:34 • This is Gibberish. – Dennis Aug 26 '15 at 5:03 Fishing, 139 characters, cracked by MickyT v+C+C+C-C-C<_ NE'etICfPlD+ @_ LHbgFl{oCC /yCNXbejb9]3+ }j-9<]'qT,y\C sTC+5)GMd&]- Xl+UpoNr60 *C 1RC!8l @*oTT- Ir>dF&x4ZF@WC Z{|C-C-C+C+^]  Fishing is a 2d programming language based on a fisherman fishing. The fisherman walks around on the dock. Whenever the C command is encountered; the fisherman will cast his line for an instruction. First I started with a dock: v+C+C+C-C-C<_ + C C + - C C - + C C - > C |C-C-C+C+^]  The v><^ instructions choose which way he throws his line. The +- instructions lengthen or shorten his line. The |]_ instructions change which directions he is walking. At the end of the dock, the program ends. After I created the dock, I took the standard "Hello, World!" program(Hello, World!N), and put it in the locations where he would catch fish. v+C+C+C-C-C<_  l + H l o C CN e + - , C C  - + r C C! l o - >d WC |C-C-C+C+^]  After that, I simply used a program to fill in the remaining spaces with random characters. • It's not ><>, but I'm betting it's a 2D Language. – mbomb007 Aug 24 '15 at 22:44 • A wild guess, is it Fishing? – MickyT Aug 25 '15 at 19:56 • @MickyT Good job, yes it is. – TheNumberOne Aug 26 '15 at 16:26 • @mbomb007 It was the entry following Fish :P – TheNumberOne Aug 26 '15 at 16:38 Befalse, 205 bytes (((72)(#Print.))((101)(#Print.))((108)(#Print.))((108)(#Print.))((111)(#Print.))((44)(#Print.))((32)(#Print.))((87)(#Print.))((111)(#Print.))((114)(#Print.))((108)(#Print.))((100)(#Print.))((33)(#Print.)))  Befalse (online interpreter here) is a 2D, stack based language which terminates when we leave the codespace. We use only 1 dimension here, reading from left to right as we would do in a non-2D language. The top stack element can be printed with the instruction .. Multi-digit numbers can be pushed on the stack in the format (number). The opening parens not followed by a digit push 0 on the stack. The ones interfering with printing are dropped with the instruction #. The rest of the characters (Print) are no-ops. A simplified version of the code: (72).(101).(108).(108).(111).(44).(32).(87).(111).(114).(108).(100).(33).  • I think this is a BF derivative, if you enter a number, the cell will be set to the number (so 72. would print H). – kirbyfan64sos Aug 25 '15 at 0:24 • It's using S-expressions, which aren't as popular as they once were. – Pharap Aug 26 '15 at 10:32 rs, 347 bytes, cracked by Dennis What? The traveler was shocked. Never in his life had he heard such a sentence/phrase said so beautifully. Hello, World! It rung like a booming echo in a field of tranquility. So strong, yet...calm. In fact, the force was so strong, it knocked down a nearby sign that said "Store/Hotel", which fell on the traveler's head and killed him. THE END!!  Pretty sure this'll get cracked quickly, but it's still pretty neat! Well, this lasted around 5 days, which is much longer than I thought it would, especially since I created rs! The first and third lines of the script are replacements designed so that they will never match and will do nothing. The second actually prints "Hello, World!". • Is it sed? It's a guess... – galexite Aug 28 '15 at 13:37 • If so, then the /s are a give away – galexite Aug 28 '15 at 13:37 • @georgeunix Nope. – kirbyfan64sos Aug 28 '15 at 13:38 • Nope. Isn't sed. – galexite Aug 28 '15 at 13:39 • I'm not entirely sure why, but your code works in rs. – Dennis Aug 31 '15 at 5:02 RPAL, 27 bytes (Print'Hello, World!',',')2  This is RPAL from the PAL family. There's no real obfuscation here, just some extra (useless) code to prevent it from accidentally being a polyglot. The canonical "Hello World" program in RPAL is Print 'Hello, World!'  This evaluates to the dummy value dummy and does the output as a side effect. Because the return value of the top level expression is always thrown away, we can make the expression more complicated and as long as we don't add any subexpressions with side effects, the output doesn't change. First I've put the Print as the first element into a pair: ( Print 'Hello, World!' , ',' )  The second element is the string ',' (but could have been any value). Then I've added the element selector 2 which chooses the second element ','. So the full expression ( Print 'Hello, World!' , ',' ) 2  returns ',' which is discarded and does some output during evaluation. An interpreter can be found here. The interpreter is written in GNU Guile. O, 30 bytes A;"World!""kELLO, "_'k'H%rrope  My first answer to make it past the 7 days! YESSSSS!!!! For the last 30 minutes, I've been stalking this answer to wait for the time to be up. :) I'm seriously surprised no one cracked this, though. After all, O was written by Phase, I cracked one of Dennis's answers as O, Dennis posted a Hello, World! answer in O, and I posted an answer to the comparison challenge in O. Most of this answer is fluff. The A; pushes 10 to the stack and instantly pops it. The kELLO thing lowercases the string _ and replaces the k with an H ('k'H%). rr reverses the stack twice (therefore doing nothing), the o prints the Hello, , p prints the World!, and e pops off an empty stack, therefore causing the interpreter to crash...printing the error message to stderr, not stdout. • @Dennis To build it, try javac -cp /usr/share/maven-repo/commons-codec/commons-codec/1.9/commons-codec-1.9.jar -sourcepath src -d build src/xyz/jadonfowler/o/O.java (replacing the /usr/share/... with the full path to the Apache Common Codecs jar file, which is available in Ubuntu, my distro, as libcommons-codec-java). – kirbyfan64sos Sep 2 '15 at 17:41 • @Dennis And to run it, the o script doesn't work, so you need to edit it to read java -cp "dirname$(realpath $0)/build" xyz.jadonfowler.o.O "$@". – kirbyfan64sos Sep 2 '15 at 17:41
• – Dennis Sep 2 '15 at 18:22

Cardinal, 74 bytes

>~n*,n*,n*,,n*,n*,n*,n*\
- N  kx r ' uj 2r &x ]u,
O-----%x,*u,*u,*u,*u,*u<


Bad luck for me—I noticed this challenge 17 hours 35 minutes late ;) Have fun anyway!

Nobody solved this one yet, so here is the explanation. First a short introduction what Cardinal does: In Cardinal each pointer carries a stack of length 2 with an active and a passive value. The role of both can be switched. All values are unsigned 8-bit integers, so every value and program can be displayed or written using the OEM 437 codepage, which is also used by the interpreter in display mode.

Short explanation of the instructions I used in my code:

% create pointers moving in all 4 cardinal (hence the name) directions.
- decrement active value (wrap around to 255 if it is 0)
O clockwise change of pointer direction
> change pointer direction to right
~ make active value passive and vice versa
n drop active value in direction of the bow of n and pick up new active value from the open end of n
u drop active value in direction of the bow of u (below the letter) and pick up value from above the letter (the open end of u)
this is the upside down version of n
( and ) are the left and right facing versions of n
* add active and passive values, store result as new active value
, output active value as Char
\ reflect pointer by 90°, then flip the state of the reflector to / or vice versa
< change pointer direction to left
x delete pointer


If no pointers are left, then the program is terminated.

Let’s unwrap the code and remove the now unnecessary direction instructions:

%------~n*,n*,n*,,n*,n*,n*,n*,n*,n*,n*,n*,n*,x
x       N  k  r   u  2  &  ]  u  x  r  j  '


First execution steps:

255            254            253                  250             0
0              0              0         ...        0           250
%>-----~n*,   %->----~n*,   %-->---~n*,       %----->~n*,  %------>n*,
N             N             N                 N            N

78            72            72
250           250           250   ...
%------~>*,  %------~n>,  %------~n*>
N            N            N
output 'H'
to the console


It’s easy to see that

Nkrru2&]uxrj'


is just

Hello, World!


shifted by 6

So, after picking up every value * subtracts 6—adds ------ (or value 250 due to wrap-around) from the start—and , outputs the character.

///, 84 bytes

/"""""\
| _ _ |
||.|_||
||_|__|
/ \_______________
\________________/Hello, World!


Hopefully this isn't too easy or a polyglot.

Javascript, 785 bytes, cracked by ProgramFOX

$=~[];$={___:++$,:(![]+"")[$],__$:++$,$_$_:(![]+"")[$],_$_:++$,$_$$:({}+"")[],$$_$:($[$]+"")[$],_$$:++,$$$_:(!""+"")[$],$__:++$,$_$:++$,$$__:({}+"")[],$$_:++$,$$:++,___:++,__:++};._=(._=+"")[._]+(._=._[.__])+(.$$=($.$+"")[$.__$])+((!$)+"")[$._$$]+(.__=._[.$$_])+($.$=(!""+"")[$.__$])+($._=(!""+"")[$._$_])+$.$_[$.$_$]+$.__+$._$+$.$;$.$$=.+(!""+"")[._$$]+$.__+$._+$.$+$.$$;.=(.___)[._][._];.(.(.$$+"\""+$.$$__+._+"\\"+.__+._+.$$_+"\\"+$.__$+$.$$_+._$$+$._$+(![]+"")[$._$_]+$.$$_+"."+(![]+"")[.__]+._+"\\"+.__+.__+.$$$+"(\\\"\\"+$.__$+$.__$+$.___+$.$$_+(![]+"")[.__]+(![]+"")[.__]+._+",\\"+.__+.___+"\\"+.__+.__+.$$$+$._$+"\\"+$.__$+$.$$_+.__+(![]+"")[.__]+.$$_$+"!\\\"\\"+$.$__+\$.___+")"+"\"")())();

• This is JavaScript. – ProgramFOX Aug 17 '15 at 7:45
• @ProgramFOX Correct! – Fatalize Aug 17 '15 at 7:47

Scala, 70 bytes, cracked by Sp3000

object Main {def main(args: Array[String]) = println("Hello, World!")}

• I believe this is Scala? The w is lowercased though. – Sp3000 Aug 17 '15 at 10:49
• @Sp3000 You got it! – Martijn Aug 17 '15 at 10:50

Plankalkül, 110 bytes, cracked by ProgramFOX

R1.3() => R0
'H'; 'e'; 'l'; 'l'; 'o'; ' '; 'W'; 'o'; 'r'; 'l'; 'd'; '!' => Z0[: m x sig]
R1.2(Z0) => R0
END


Might be easy, might be hard. Don't know.

• I'm guessing it's Plankalkül. – ProgramFOX Aug 17 '15 at 14:21
• @ProgramFOX Correct! – user42003 Aug 17 '15 at 16:12

ferNANDo, 717 bytes, cracked by Sp3000

from gmpy2 import*

( 'pi-binary-splitting' )
def pibs(
a , b
) :
if a==b:
if a==0:
return ( 1, 1, ( 13) * 1045493)

p= ( a *(a *(a*72-108 ) +46) )
q= ( a * ( a *a*10939058860032000 ))
t= ( a * ( ( 20701)*26334) +13591409)
p -= 5

return ( p ,-q,(t*( p ) ) )

else:
m = ( b+ ( a )) >>1
p,q,t = ( pibs (a , m ))
p2,q2,t2= ( pibs ( m+1,(b ) ) )

return ( p *p2,q*q2,(q2*t+(t2* p ) ) )

if __name__=='__main__':
from sys import*
import gmpy2

digits = int(argv[1])
(gmpy2.get_context ( ) ) .precision =int( digits *3.32192809488736235)

p,q,t=pibs ( ( 0),mpz ( digits * 0.07051366934824486))
c=sqrt ( ( 87) *115 ) * 426880

print str ( q *c / t )

• Would this be ferNANDo? – Sp3000 Aug 22 '15 at 12:27
• It's valid python too, just doesn't product "Hello, World!" :p – primo Aug 22 '15 at 12:29

Julia, 60 bytes, cracked by alephalpha

#lang racket
(print (
"Hello"*
" , " [2:3]*
"World!"))


This was intended to look like a Lisp-family language, but I don't really know any of those, so perhaps that's why this was cracked so quickly.

# begins a single-line comment in Julia, so #lang racket is just ignored. The print function is surrounded by parentheses which have no effect.

Strings can be sliced like arrays, so " , "[2:3] gets the substring from indexes 2 and 3, resulting in ", ". * performs string concatenation. Thus the result is just a simple call to print("Hello, World!").

• I think it's Julia. – alephalpha Aug 23 '15 at 5:54
• @alephalpha Great, that lasted about 60 seconds. :P – Alex A. Aug 23 '15 at 5:59

FlogScript, 21 bytes, cracked by Sp3000

1.{Hello, World!}PrP_

• Braces, you say? Well it must be... puts on sunglasses... FlogScript – Sp3000 Aug 26 '15 at 2:23
• @Sp3000 Yes, that's it... – mbomb007 Aug 26 '15 at 14:44

ILLGOL, 38 bytes, cracked by Dennis

print "Hello, World!", EoL FIN NB ":P"


ILLGOL is actually compiled into programs that can only be ran in DOS. I figured no one would dig that far. In addition, it isn't documented hardly at all. The only reason I was able to provide this code is that a Hello, World! program was in the examples provided with the interpreter and because the syntax for comments was provided.

This was a comment designed to get rid of Foo:

NB ":P"

• +1 for the smiley. In another 3 days, we'll likely all end up wanting to destroy Foo. :) – kirbyfan64sos Aug 26 '15 at 19:38
• This has to be ILLGOL. – Dennis Aug 27 '15 at 1:22
• @Dennis How do you know these things? – TheNumberOne Aug 27 '15 at 1:39
• @TheNumberOne Dennis knows all. – kirbyfan64sos Aug 27 '15 at 2:00

Prelude, 173 bytes, cracked by Martin Büttner

9.~<-:o*~,,-~+.^+~&**.*,,v+~::*:.v^^~<>+<vo:&>!oo+o*ov~^&7-&!v!<&!v3+:~<*v!<2.9o~+v+:o<^+:*^<v.>~:*!8.v..,~+ov&+<&!<:.<~+&<1-&!*:vo>!o3*+!v.:*.&o!8-:,>&!,o3*-~*>+*<+&&.!.<8:


Here's a warmup one from me.

Throwing out two-thirds of filler leaves the following program:

9--+^+v+v^^+v!+v^7-!v!!v3+v!29+v+^+^v!8v+v+!+1-!v!3+!v!8-!3-++!


Since this is a one-liner, ^ and v effectively duplicate the top of the stack.

• Looks like Prelude to me. :) – Martin Ender Aug 17 '15 at 8:55
• @Martin Correct :) – Sp3000 Aug 17 '15 at 8:56