Video games are an industry worth tens of billions of dollars. Games make more money than Hollywood and the music industry combined. Video games can be great fun and even great art, but they can also be great propaganda. A new game called IS Defense puts players on the shores of Europe to defend the continent against waves of faceless Islamic attackers. The FBI, North Korea and even PETA have tried to use games to get their points across. It doesn’t always work and it’s often silly, but governments are only just getting started.