Thank you for help with stuff (in any sort of way):

Jan, Viv_CCGS, Plasmatic, Badmode, Xyene, Kirito, quantum, kingW3, TimothyW553, maxcruickshanks, d, Spitfire720, awaykened, Nils_Emmenegger, Tomorrow, ThingExplainer.

Random Thing: 80865e99adb7458d44e1b438c7488b048055ceb3e849ab903b1e50f5de4c358a

User-Script:

Show hidden comments:

$(k=>$("a[href^='javascript:comment_show_content(']").each((i,j)=>comment_show_content(parseInt(j.href.replace(/^\D+/g,"")))));

Problem Hints:

Hello, World! (Hard):

End the first line in \n, end the second line in \r, and end the third line in \r\n.

The Return of A Plus B:

There is only one test case, in which N is equal to 1521. (This is probably the reason why "Your code must not be longer than 1521 bytes.") The input can be in four languages: English words, decimal numbers, French, or Simplified Chinese.

1-10 in decimal numbers: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10"]

1-10 in English words: ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"]

1-10 in French: ["un", "deux", "trois", "quatre", "cinq", "six", "sept", "huit", "neuf", "dix"]

1-10 in Simplified Chinese: ["一", "二", "三", "四", "五", "六", "七", "八", "九", "十"]

If the number is in a language, convert it to decimal numbers and add them up.

Note: A can be in one language and B can be in another, i.e. deux 四. In this case, your program should output 6.

Miracle Sort:

The inputs are likely like this: 1 2 3 5 7. Just output the numbers in input order and you will get AC.

Too Simple:

The following characters are not allowed in code: "'1234567890.

Boolean (Warmup, Easy, Medium, Hard and Lunatic): You need to spam a certain output as many times as possible until you get it.

Obligatory Wood IV Problem:

bruh

April Fools' Warmup Problem:

AK means All Kill.

Scroll:

There is no input for this problem. Don't ask for one. It appears that any non-empty output will get AC.

Quine:

Probably not exactly worth 10 points? In the words of georgezhang006:

Bru, so many people copied from the wikipedia page w/out even removing the comments!

But don't do that or they will be mad...

Random Stuff

How is this a valid solution to Piggy