Ready Player Two. Ernest Cline

With access to cutting-edge technology, Wade Watts opens the door to an even deeper level of virtual reality - so realistic that the line between game and life begins to blur. But with new opportunities comes a new threat: a dangerous quest left by the creator of OASIS, which may cost humanity dearly. To save the world and his friends, Wade must once again delve into a maze of pop culture references, complex puzzles and his own fears. But this time the stakes are much higher - and the game has long ceased to be just a game.