Nintendo has a nice gaming advent calendar online called "Mission in Snowdriftland
." Each little window opens a minigame into a snowbound Mario-esque world, and you guide a snowman around collecting snowflakes. It's simple and fun, and the music ain't half bad either. Sure, there are ads pimping Nintendo games in the bottom right hand window, but it's a small price to pay for a sweet little gaming diversion in your web browser.