Games like Restitutor: Three Kingdoms United
Games like Restitutor: Three Kingdoms United include Slay the Spire, RimWorld, Timberborn, Ages of Conflict: World War Simulator, and Manor Lords. We matched them by the tags players give Restitutor: Three Kingdoms United on Steam (Downloadable Content): closest matches first, and among equally close ones the better-known games.

Slay the Spire
Shared: Single-player · Steam Achievements · Steam Workshop

RimWorld
Shared: Single-player · Steam Workshop · Strategy

Timberborn
Shared: Single-player · Steam Achievements · Steam Workshop

Ages of Conflict: World War Simulator
Shared: Single-player · Steam Achievements · Simulation

Manor Lords
Shared: Single-player · Strategy · Steam Achievements

Mount & Blade II: Bannerlord
Shared: Single-player · Strategy · Steam Achievements

shapez 2 - Factory
Shared: Single-player · Steam Achievements · Steam Workshop

Euro Truck Simulator 2
Shared: Single-player · Steam Achievements · Simulation

Game Dev Tycoon
Shared: Single-player · Simulation · Steam Achievements

Plague Inc: Evolved
Shared: Single-player · Strategy · Simulation

Cities: Skylines
Shared: Single-player · Simulation · Steam Achievements

Going Medieval
Shared: Single-player · Steam Achievements · Strategy

Hearts of Iron IV
Shared: Single-player · Strategy · Steam Achievements

Paralives
Shared: Single-player · Simulation · Steam Workshop

Terra Invicta
Shared: Single-player · Strategy · Simulation

Gold Mining Simulator
Shared: Single-player · Simulation · Steam Achievements

Against the Storm
Shared: Single-player · Strategy · Simulation

Stoneshard
Shared: Single-player · Steam Achievements · Strategy

American Truck Simulator
Shared: Single-player · Steam Achievements · Steam Workshop

TCG Card Shop Simulator
Shared: Single-player · Simulation · Steam Achievements

Cultist Simulator
Shared: Single-player · Steam Achievements · Steam Workshop

Stellaris
Shared: Single-player · Strategy · Steam Achievements

Europa Universalis IV
Shared: Single-player · Strategy · Steam Achievements

Norland
Shared: Single-player · Strategy · Simulation