Dungeon Crawler Carl: The Gate of the Feral Gods

Dungeon Crawler Carl: The Gate Of The Feral Gods (HC), by Matt Dinniman, is book #4 in Matt Dinniman's popular LitRPG Dungeon Crawler Carl series, following the adventures of Carl and his cat, Princess Donut, as they navigate a deadly, game-show-style dungeon.

In this installment, they face new challenges on the fifth floor, which involves conquering four biome-themed castles (like a floating fortress and a sand castle) to unlock the next level, forcing them to form unlikely alliances with other players.

This is the hardcover version suggested for ages 16+.