Insane. Ridiculous. Unbelievable. Those are just a few of the words I'd use to describe the success of PlayerUnknown's Battlegrounds.

PUBG has now officially sold 10 million copies since March, which is a feat for any game without the words "Grand Theft Auto," "Mario," "Call of Duty" or "Pokemon" in the name.

But PUBG isn't just any game. At the time of this writing, it's still a buggy, unfinished Steam Early Access title with only a single level you can play.

It's a heck of a level, mind you: you and 99 other players parachute onto an 8-square-kilometer island filled with deadly weaponry, and use your wits to be the last man standing. It's one of the most stressful, addictive things I've ever played.

Enlarge Image Sean Hollister/CNET

So 10 million? Bonkers. And sales only appear to be accelerating. As you can see in my handy-dandy chart, the game went from selling 1 million copies a month to 2 million a month back in June, and now it might even be doing 3 million a month.

Let's put that in context. Zelda: Breath of the Wild, which also released in March, only sold 3.92 million copies as of July.

Of the top 50 best-selling games of all time (according to Wikipedia), only one might serve as a historical precedent: Minecraft, which was similarly released unfinished before its rise to fame. (Minecraft has sold over 121 million copies.)

But even Minecraft didn't initially have viral popularity like this:

And PUBG hasn't even arrived on Xbox yet. That'll happen this fall.

So you might be wondering: Who the heck is PlayerUnknown, and where did this game come from? If so, you might want to check out our huge interview with the man behind it all.