Games like Quartermark
Games like Quartermark include Loot of Baal, Darkest Dungeon®, Grim Dawn, Path of Exile, and Dragon Cliff. We matched them by the tags players give Quartermark on Steam (Inventory Management, RPG, Auto Battler, Idler, and Dungeon Crawler): closest matches first, and among equally close ones the better-known games.

Loot of Baal
Shared: RPG · Idler · Inventory Management

Darkest Dungeon®
Shared: RPG · Dungeon Crawler · Dark Fantasy

Grim Dawn
Shared: RPG · Loot · Dungeon Crawler

Path of Exile
Shared: Dark Fantasy · RPG · Dungeon Crawler

Dragon Cliff
Shared: RPG · Idler · Strategy

Path of Idle: Old Gods Rising
Shared: RPG · Idler · Strategy

Idle Champions of the Forgotten Realms
Shared: Idler · Strategy · RPG

Legends of Dragaea: Idle Dungeons
Shared: Auto Battler · RPG · Idler

Bones and Coins
Shared: Auto Battler · Dungeon Crawler · Idler

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

Mini Healer
Shared: Party-Based RPG · Dungeon Crawler · RPG

Path of Exile 2
Shared: RPG · Loot · Dungeon Crawler

TBH: Task Bar Hero
Shared: Idler · RPG · Auto Battler

Megaloot
Shared: Inventory Management · RPG · Dungeon Crawler

Dragon Age: Origins - Ultimate Edition
Shared: RPG · Party-Based RPG · Fantasy

Backpack Battles
Shared: Inventory Management · Auto Battler · Strategy

Torchlight II
Shared: RPG · Dungeon Crawler · Loot

Wolcen: Lords of Mayhem
Shared: RPG · Loot · Dungeon Crawler

Fellowship
Shared: RPG · Dungeon Crawler · Party-Based RPG

9 Kings
Shared: RPG · Auto Battler · Strategy

Between Adventures IDLE
Shared: RPG · Idler · Inventory Management

He is Coming
Shared: Auto Battler · RPG · Strategy

Diablo II: Resurrected – Infernal Edition
Shared: RPG · Dungeon Crawler · Strategy

Hero Tale
Shared: RPG · Auto Battler · Dungeon Crawler