Games like Dummynation
Games like Dummynation include Victoria 3, Hearts of Iron IV, Europa Universalis IV, Victoria II, and Sid Meier's Civilization VII. We matched them by the tags players give Dummynation on Steam (Grand Strategy, Military, Simulation, Strategy, and Indie): closest matches first, and among equally close ones the better-known games.

Victoria 3
Shared: Grand Strategy · Simulation · Strategy

Hearts of Iron IV
Shared: Grand Strategy · Strategy · Military

Europa Universalis IV
Shared: Grand Strategy · Strategy · Simulation

Victoria II
Shared: Grand Strategy · Strategy · Simulation

Sid Meier's Civilization VII
Shared: Grand Strategy · Strategy · Military

Crusader Kings III
Shared: Grand Strategy · Strategy · Simulation

Europa Universalis V
Shared: Grand Strategy · Strategy · Simulation

Terra Invicta
Shared: Grand Strategy · Simulation · Strategy

Rebel Inc: Escalation
Shared: Grand Strategy · Simulation · Strategy

Total War: THREE KINGDOMS
Shared: Strategy · Grand Strategy · Military

Democracy 4
Shared: Strategy · Simulation · Grand Strategy

Imperator: Rome
Shared: Grand Strategy · Strategy · Simulation

Manor Lords
Shared: Strategy · Simulation · Grand Strategy

Age of History II
Shared: Grand Strategy · Strategy · Simulation

SuperPower 2 Steam Edition
Shared: Grand Strategy · Simulation · Strategy

Steel Division 2
Shared: Strategy · Military · Simulation

Men of War: Assault Squad 2
Shared: Strategy · Simulation · Military

Dune: Spice Wars
Shared: Grand Strategy · Strategy · Management

Anno 1800
Shared: Simulation · Strategy · Economy

NEBULOUS: Fleet Command
Shared: Grand Strategy · Simulation · Strategy

Total War: EMPIRE – Definitive Edition
Shared: Military · Grand Strategy · Strategy

Age of History 3
Shared: Grand Strategy · Strategy · RTS

Total War: NAPOLEON – Definitive Edition
Shared: Grand Strategy · Strategy · Military

Stellaris
Shared: Grand Strategy · Strategy · Simulation

