If you're looking for the best LitRPG and progression fantasy book series to binge, these two are the gold standard. Dungeon Crawler Carl by Matt Dinniman follows a man and his ex-girlfriend's prize-winning cat trapped in a deadly alien game show dungeon — it's dark, hilarious, and genuinely emotional all at once. The Primal Hunter by Zogarth follows Jake, a bored office worker who discovers the multiverse apocalypse is basically the best thing that ever happened to him, as he evolves from a tutorial survivor into a cosmic-level apex hunter. Both series feature deep progression systems, satisfying level-ups, and the kind of world-building that makes it impossible to put them down. All books are listed in reading order so you can jump in and never lose your place.