Here's a brief summary from the official site, Minecraft: "Minecraft is a game about placing blocks to build anything you can imagine. At night monsters come out, make sure to build a shelter before that happens." Trust me, it's a lot more fun than it sounds.
I think the beauty of this game lies in its simplicity. There's not point to it except to stay alive. You start the game with nothing, you're told nothing; basically you have nothing to go on. The twist comes when you find that almost any block in the game can be collected and then placed where you want. Not only that, but many blocks can be crafted into tools, doors, switches, armor, etc. The games sense of creation and exploration is palpable. The important thing to remember is not to let night creep up on you while you're creating...
If you're interested, the game's fairly cheap to buy. It's still in development by its creator "Notch", who releases updates somewhat regularly. Of course it's possible to find copies of the game for free, but most fans of the game will hate you for doing that. The choice is yours. Enjoy!
