Jogador Nº 1 by Ernest Cline

In a near-future world where people escape a grim reality by living inside an expansive virtual universe, a teenage avatar embarks on a high-stakes treasure hunt left by the virtual world's eccentric creator: solve retro pop-culture riddles to claim a vast fortune and control of the simulation. Along the way he forms alliances, faces a ruthless corporation willing to use violence and corruption to seize the prize, and confronts questions about identity, friendship, and what counts as real in life and love.