These extremely blocky skeletons want my blood. Luckily there's a door in the way, putting a severe flaw into the undead's attack plan.
You might be thinking to yourself right now, "What is minecraft? And why is it so popular?" Well, I would like to tell you, but I really don't have an answer. I was trying to explain the game to friend the other day and the best I came up with was "Imagine you're in a 3D retro world playing with Legos building houses and items and it's filled with zombies that feed on people playing with Legos. You want to keep your brains inside your head so you have to build a house to stay safe while playing with your Legos. Also you can mine and stuff." Yeah, it's something you just have to try yourself. It's fun though, really.
There are rare items and candy underneath lava streams. (No lie)
So how popular is the game? Well, the creator is currently selling the ALPHA version (as in, not complete, prone to bugs) for 9.95 Euros/13.87 USD and has sold over 360,000 copies. Don't worry, I did the math for you. 4,993,200. Almost 5 million USD, and he's just now starting to hire people to boost development. Holy shit.
Oh, and it's worth mentioning that there's a player building a to scale size model of the Enterprise. No joke.
So if you haven't already, give it a try.