An idea to generate 300 million downloads? Angry cartoon birds attacking green, egg-snatching pigs. Yes, that’s what this No. 1 mobile app is all about. Finnish gaming company Rovio Mobile’s Peter Vesterbacka is one of the masterminds behind the deceptively simple yet seriously addictive game Angry Birds. The game earned Vesterbacka, or Mighty Eagle as his business card reads, a spot on TIME’s 2011 Most Influential People list.