https://tvtropes.org/pmwiki/pmwiki.php/Webcomic/SaveThePrincess

Save the Princess is a series of uncommon adventure comics first seen in the Video Games board of the infamous 4chan. A bumbling Idiot Hero, usually going by the name of Anon or Hero must save a princess from an enemy. Players must have the ending digit on their post number be equal to one of the GET Numbers (usually 7, 8, and 9) in order for the story to progress. Because of this, things can get out of hand very fast. Most stories are notorious for their participators making the artist create Fanservice, usually to either the delight or anger of the others.