Games like Royal's Gambit
Games like Royal's Gambit include Balatro, Slay the Spire, Monster Train, Stacklands, and Slay the Spire 2. We matched them by the tags players give Royal's Gambit on Steam (Solitaire, Card Battler, Roguelite, PvE, and Difficult): closest matches first, and among equally close ones the better-known games.

Balatro
Shared: Card Game · Roguelite · Strategy

Slay the Spire
Shared: Card Battler · Card Game · Roguelite

Monster Train
Shared: Card Battler · Roguelite · Card Game

Stacklands
Shared: Roguelite · Card Battler · Card Game

Slay the Spire 2
Shared: Card Game · Card Battler · Strategy

Inscryption
Shared: Card Battler · Card Game · Roguelite

Wildfrost
Shared: Card Battler · Difficult · Roguelite

Griftlands
Shared: Card Battler · Roguelite · Card Game

Ratropolis
Shared: Card Battler · Roguelite · Card Game

Cross Blitz
Shared: Roguelite · Card Battler · Card Game

Library Of Ruina
Shared: Difficult · Card Game · Strategy

One Step From Eden
Shared: Roguelite · Card Battler · Difficult

9 Kings
Shared: Card Game · Strategy · Roguelite

NEOVERSE
Shared: Card Battler · Roguelite · Card Game

Die in the Dungeon
Shared: Card Battler · Card Game · Strategy

Vault of the Void
Shared: Card Battler · Roguelite · Card Game

StarVaders
Shared: Roguelite · Difficult · Card Game

Loop Hero
Shared: Roguelite · Card Game · Deckbuilding

One Turn Kill
Shared: Card Battler · Card Game · Solitaire

Vampire Crawlers: The Turbo Wildcard from Vampire Survivors
Shared: Card Battler · Card Game · Strategy

Dicey Dungeons
Shared: Card Battler · Roguelite · Card Game

Super Fantasy Kingdom
Shared: Roguelite · Strategy · Card Game

The Bazaar
Shared: Card Battler · Card Game · PvE

Breachway
Shared: Card Game · Card Battler · Roguelite