Games like Seven Nations
Games like Seven Nations include Total War: WARHAMMER II, Plague Inc: Evolved, Men of War: Assault Squad 2, Total War: WARHAMMER III, and Door Kickers. We matched them by the tags players give Seven Nations on Steam (Action, Casual, Indie, Simulation, and Strategy): closest matches first, and among equally close ones the better-known games.

Total War: WARHAMMER II
Shared: Strategy · Action · RTS

Plague Inc: Evolved
Shared: Simulation · Strategy · Indie

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

Total War: WARHAMMER III
Shared: Strategy · RTS · Action

Door Kickers
Shared: Action · Strategy · Simulation

Call to Arms
Shared: Action · Strategy · RTS

911 Operator
Shared: Simulation · Strategy · Indie

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie

Kingdom Rush - Tower Defense
Shared: Strategy · Casual · Action

Game Dev Tycoon
Shared: Indie · Simulation · Casual

Wargame: Red Dragon
Shared: Strategy · RTS · Tactical

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Indie · Tactical

Total War: THREE KINGDOMS
Shared: Strategy · RTS · Action

Ultimate Epic Battle Simulator 2
Shared: Action · Simulation · Strategy

Formata
Shared: Action · Indie · Strategy

Circle Empires
Shared: Casual · Indie · Strategy

Mini Motorways
Shared: Casual · Simulation · Strategy

Sea Power : Naval Combat in the Missile Age
Shared: Simulation · Strategy · Action

Ultimate Epic Battle Simulator
Shared: Simulation · Action · Strategy

Steel Division 2
Shared: Strategy · RTS · Simulation

Total Tank Simulator
Shared: Action · Simulation · Strategy

Retrowave
Shared: Indie · Casual · Action

House Flipper
Shared: Simulation · Casual · Singleplayer

Aliens: Dark Descent
Shared: Action · Strategy · Tactical

