It’s a big day for Angry Birds lovers, with Rovio busting out a free upgrade today for iOS with 15 special levels to honor the game’s second birthday on December 11. All episodes of the original Angry Birds game will be unlocked, so no matter how poorly you play the game, you can now take a peek into the first level of each episode. Whether you can climb up each level within those newly revealed episodes is entirely up to you. @Yungjohnnybravo @TatWZA