16. Halo 3
https://www.youtube.com/watch?v=3rridXskgWg This 'Believe' trailer for Halo 3 is either a thought-provoking look at war in video games or incredibly cheesy, depending on who you ask. Based around a series of static miniatures, this ad has since gone on to be parodied by many games since. There's no doubt that it helped to build a lot of hype for the third game in Bungie's iconic series, thanks to its melancholy music and the clear amount of effort that went into creating the model battlefield.