Ready player one, by Ernst Cline

This is a very good read, fun and serious too.  It is especially intriguing for 80's kids who grew up with Atari and stuff like that, Back to the Future etc.  The premise is that a Steve Jobs type dude leaves all his fortune to the one player to crack his game and find the Easter Egg.  It gets pretty entertaining as the main character starts to unlock the clues and gets threatened and attacked in real life by his adversaries.