Minecraft is available on nearly every system known to man at this point, meaning it's really easy to buy. And people are buying it! The game sold 435,000 copies on December 25 alone.
Markus "Notch" Persson tweeted about this achievement earlier today (later correcting the date). It seems that a lot of people felt like playing with digital blocks after opening presents. Congratulations Minecraft! Notch probably has enough money to buy a small island nation now.
[Source: www.GameInformer.com ]