Games like Dungeon 100
Games like Dungeon 100 include 9 Kings, Loop Hero, Balatro, Slay the Spire 2, and Slay the Spire. We matched them by the tags players give Dungeon 100 on Steam (Strategy RPG, Auto Battler, Deckbuilding, Roguelike, and Perma Death): closest matches first, and among equally close ones the better-known games.

9 Kings
Shared: Auto Battler · Roguelike · RPG

Loop Hero
Shared: Roguelike · Deckbuilding · Strategy RPG

Balatro
Shared: Roguelike · Deckbuilding · Card Game

Slay the Spire 2
Shared: Roguelike · Deckbuilding · Strategy

Slay the Spire
Shared: Roguelike · Deckbuilding · Card Game

Super Fantasy Kingdom
Shared: Auto Battler · Roguelike · RPG

Darkest Dungeon®
Shared: Roguelike · RPG · Dark Fantasy

He is Coming
Shared: Auto Battler · Roguelike · Strategy

Tainted Grail: Conquest
Shared: Deckbuilding · Roguelike · Dark Fantasy

Peglin
Shared: Deckbuilding · Roguelike · Perma Death

The Last Spell
Shared: RPG · Strategy · Strategy RPG

The Last Flame
Shared: Auto Battler · Roguelike · Strategy

Hadean Tactics
Shared: Auto Battler · Roguelike · Deckbuilding

Inscryption
Shared: Deckbuilding · Roguelike · Card Game

Roguebook
Shared: Deckbuilding · RPG · Strategy

Marvels Midnight Suns Digital Edition
Shared: Deckbuilding · Strategy RPG · Turn-Based Strategy

Shogun Showdown
Shared: Strategy RPG · Roguelike · Strategy

FTL: Faster Than Light
Shared: Roguelike · Strategy · Perma Death

Monster Train
Shared: Deckbuilding · Roguelike · Card Game

Prime of Flames
Shared: Strategy RPG · Roguelike · RPG

Monster Train 2
Shared: Deckbuilding · Roguelike · Strategy

Die in the Dungeon
Shared: Roguelike · Deckbuilding · Strategy

Total War: WARHAMMER
Shared: Strategy RPG · RPG · Strategy

Dwarves: Glory, Death and Loot
Shared: Auto Battler · Roguelike · RPG