EA today announced that Plants vs. Zombies 2 has been downloaded 16 million times worldwide since being released last Thursday. Plants vs. Zombies 2 is the followup to EA's popular Plants vs. Zombies title, which originally debuted on the App Store in 2010. Plants vs. Zombies 2 utilizes the same lane defense gameplay that made the original game a hit, but it also offers up some new plants, new gameplay mechanics, and time travel to settings like ancient Egypt. With 16 million downloads, it represents EA's most successful mobile game launch to date. During EA's Gamescom press conference this morning (via