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Though Ready Player One was probably my favorite "gaming book" by Ernest Cline, most people have never heard of Armada by Ernest Cline. It's definitely in my top 5 favorite books and definitely worth the read.
"Snow Crash" by Neal Stephenson. Love me some Neal, and many of his books involve video games, MMOs, virtual reality and alternate reality, but Snow Crash predates most of those while still being gripping and thrilling. A cyberpunk neo noir. Probably some of the most accessible Stephenson.
Ready Player One is excellent despite the unwarranted hate it gets. But I'm gonna recommend this fun Tetris graphic novel I got at NY Comic Con a few years ago.