It's a webcomic.
It's a tale about a boy and his friends and a game they play together.
On his 13th birthday, John Egbert starts playing a mysterious videogame called Sburb. Unfortunately, this triggers the apocalypse. Fortunately, he and his friends can make things right—if they can beat the game. They’ll need a lot of teamwork, a little luck, and some inspired shenanigans along the way to make it through this mind-bending, genre-defying adventure.
It's also one of the most spectacular pop-culture phenomena of the past decade, beloved by millions of readers: a unique and massive internet-based narrative work consisting of comics, chat logs, gifs, games, animation, and music.
However it is over 8000 pages long and consists of 800,000 words so read at your own risk.
Don't say we didn't warn you.