Games like Simple War: The Unbroken Treaties
Games like Simple War: The Unbroken Treaties include Into the Breach, Hearts of Iron IV, Company of Heroes 3, Your Only Move Is HUSTLE, and The Last Spell. We matched them by the tags players give Simple War: The Unbroken Treaties on Steam (Pixel Graphics, Strategy, Minimalist, Alternate History, and Turn-Based Strategy): closest matches first, and among equally close ones the better-known games.

Into the Breach
Shared: Strategy · Pixel Graphics · Turn-Based Strategy

Hearts of Iron IV
Shared: Strategy · World War II · Alternate History

Company of Heroes 3
Shared: Strategy · Wargame · Singleplayer

Your Only Move Is HUSTLE
Shared: Strategy · Turn-Based Strategy · Pixel Graphics

The Last Spell
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

Wargroove
Shared: Strategy · Pixel Graphics · Turn-Based Strategy

Age of History 3
Shared: Strategy · Wargame · Alternate History

Hero's Hour
Shared: Pixel Graphics · Strategy · Turn-Based Strategy

Axis and Allies 1942 Online
Shared: Strategy · Wargame · Turn-Based Strategy

XCOM®: Chimera Squad
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

ROMANCE OF THE THREE KINGDOMS XIV
Shared: Wargame · Turn-Based Tactics · Strategy

Sid Meier’s Civilization® VI
Shared: Strategy · Turn-Based Strategy · Singleplayer

Panzer Corps 2
Shared: Strategy · Turn-Based Strategy · World War II

Age of History II
Shared: Strategy · Turn-Based Strategy · World War II

Panzer Corps Gold
Shared: Strategy · Turn-Based Strategy · World War II

STAR WARS Zero Company™
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

Order of Battle: World War II
Shared: Strategy · World War II · Wargame

The Battle of Polytopia
Shared: Strategy · Turn-Based Strategy · Minimalist

The Heroic Legend of Eagarlnia
Shared: Strategy · Turn-Based Strategy · Alternate History

XCOM: Enemy Unknown
Shared: Strategy · Turn-Based Strategy · Singleplayer

XCOM 2
Shared: Strategy · Turn-Based Tactics · Singleplayer

Unity of Command II
Shared: Strategy · World War II · Wargame

Europa Universalis IV
Shared: Strategy · Alternate History · Wargame

ROMANCE OF THE THREE KINGDOMS 8 REMAKE
Shared: Wargame · Turn-Based Tactics · Strategy