Games like The Secret Dungeon
Games like The Secret Dungeon include Hero Siege, Heroes of Hammerwatch II, 暖雪 Warm Snow, Halls of Torment, and Death Must Die. We matched them by the tags players give The Secret Dungeon on Steam (RPG, Action Roguelike, Action RPG, Action-Adventure, and 2D): closest matches first, and among equally close ones the better-known games.

Hero Siege
Shared: Action RPG · Action Roguelike · RPG

Heroes of Hammerwatch II
Shared: RPG · Action Roguelike · Action RPG

暖雪 Warm Snow
Shared: Action Roguelike · Action-Adventure · RPG

Halls of Torment
Shared: Action Roguelike · Action RPG · RPG

Death Must Die
Shared: Action Roguelike · RPG · 2D

UnderMine
Shared: Action Roguelike · RPG · Roguelite

Vampire Survivors
Shared: Action Roguelike · 2D · Roguelite

The Slormancer
Shared: Action RPG · RPG · 2D

Last Epoch
Shared: Action RPG · RPG · Top-Down

Black Myth: Wukong
Shared: Action RPG · RPG · Action-Adventure

Anomaly Agent
Shared: Action Roguelike · Side Scroller · 2D Platformer

Chinese Online Game
Shared: Action Roguelike · CRPG · Action RPG

Skul: The Hero Slayer
Shared: Action Roguelike · 2D · Indie

Minecraft Dungeons
Shared: RPG · Action RPG · Action-Adventure

Wolcen: Lords of Mayhem
Shared: Action RPG · RPG · Action

Moonlighter
Shared: Action Roguelike · RPG · Action RPG

Heroes of Hammerwatch
Shared: Action Roguelike · RPG · Roguelite

Dungreed
Shared: Action Roguelike · 2D · RPG

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Action RPG · RPG

Hades
Shared: Action Roguelike · Roguelite · RPG

Hades II
Shared: Action Roguelike · RPG · Action RPG

ASTLIBRA Revision
Shared: Action RPG · 2D · RPG

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

Lost Castle
Shared: Action Roguelike · Side Scroller · Dungeon Crawler