Armada by Ernest Cline

If we stand a chance, it will be the gamers who save us. Because maybe, just maybe, they've been training us as drone warriors through video games.

Zack lost his dad before he was a year old, and he's spent his youth a little obsessed about the same movies, music, and games his dad loved, just to feel a kinship. So on the day of the alien invasion, Zack finds he's perfectly positioned for a top spot in the real-world fighting force he's been trained on in his favorite game.

In the face of potential extermination, much about the world changes: the bonds of friendship and family are stronger, and so is the possibility of love at first sight. But is human nature what will save us, or what dooms us? We'll have to play out this game to see.

I loved Ready Player One, and this is just as good.