A Parade of Horribles by Matt Dinniman

It's off to the races for Carl and Donut in the eighth book in the New York Times bestselling Dungeon Crawler Carl series.

As chaos and mass panic spread outside the dungeon in the wake of Faction Wars, Carl and Donut find themselves on the tenth floor, where they're forced to compete in a surprisingly normal set of tasks. Races. Get from point A to point B, and don't come in last. It all seems a a little too simple.

Ignore those whispers about what's happening on the mysterious eleventh floor, something the system AI calls A Parade of Horribles. Nobody, not even the showrunners, knows what that means. Just that the AI has ominously dubbed it \"a coming-out party for the ages.\"

So Carl is planning a party of his own.
But if it goes wrong, it's not just the end of Carl and Donut. No. The stakes are higher than they've ever been.