The magical art of Arithmancy can be a huge help to video-game marketing executives, charting the best days to hold a sale, raise prices, or release an entire game. Warner Bros., of course, has access to the best wizards of our age and it was able to calculate the most profitable day to release Lego Harry Potter: Years 5-7 -- 11-11-11.

Now we just have to figure out which wizards are working with Bethesda and hope they're not evil. Oh, it looks like one of them is named Tom Riddle. That sounds like a safe, friendly name. We should be all right.