Games like Diplomacy is Not an Option
Games like Diplomacy is Not an Option include They Are Billions, Age of Empires II (Retired), Oxygen Not Included, Farthest Frontier, and Cossacks 3. We matched them by the tags players give Diplomacy is Not an Option on Steam (Resource Management, Medieval, Historical, Zombies, and Base Building): closest matches first, and among equally close ones the better-known games.
They Are Billions
Shared: Base Building · Zombies · Colony Sim
Age of Empires II (Retired)
Shared: Medieval · Historical · RTS
Oxygen Not Included
Shared: Resource Management · Base Building · Colony Sim
Farthest Frontier
Shared: Resource Management · Medieval · Historical
Cossacks 3
Shared: Resource Management · Historical · RTS
Frostpunk
Shared: Resource Management · Survival · Colony Sim
Manor Lords
Shared: Base Building · Historical · Resource Management
Banished
Shared: Colony Sim · Medieval · Resource Management
From Glory To Goo
Shared: Resource Management · Base Building · RTS
Age of Empires III: Definitive Edition
Shared: Base Building · Historical · RTS
Kingdoms and Castles
Shared: Resource Management · Colony Sim · Base Building
Infection Free Zone
Shared: Base Building · Zombies · RTS
Ostriv
Shared: Historical · Resource Management · Colony Sim
Stronghold Crusader HD (2012)
Shared: Medieval · Colony Sim · Base Building
Against the Storm
Shared: Base Building · Resource Management · Historical
Stronghold Crusader: Definitive Edition
Shared: Medieval · Colony Sim · Strategy
Workers & Resources: Soviet Republic
Shared: Base Building · Historical · Resource Management
Age of Darkness: Final Stand
Shared: Base Building · RTS · Action RTS
This War of Mine
Shared: Survival · Resource Management · Base Building
7 Days to Die
Shared: Zombies · Base Building · Survival
RimWorld
Shared: Base Building · Colony Sim · Survival
Dawn of Man
Shared: Colony Sim · Historical · Survival
Stronghold: Definitive Edition
Shared: Medieval · RTS · Colony Sim
Becastled
Shared: Medieval · Base Building · Colony Sim