Games like Operation: Harsh Doorstop
Operation: Harsh Doorstop is the ultimate, free to play, tactical shooter sandbox. Play singleplayer, multiplayer, or co-op modes and explore thousands of community-created maps, weapons, and vehicles via the Steam Workshop. Created by ex-developers of Squad, Red Orchestra, and Insurgency.

Top 12 games similar to Operation: Harsh Doorstop
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Squad
Squad is a tactical FPS that provides authentic combat experiences through teamwork, communication, and realistic combat. It bridges the gap between arcade shooter and military realism with 100-player battles, combined-arms warfare, and base building.
ActionIndieMassively Multiplayer - 2

Arma 3
Experience true combat gameplay in a massive military sandbox. Deploy with a wide variety of single- and multiplayer content, a massive arsenal of modern weapons and vehicles, and limitless opportunities for content creation. Authentic, diverse, open - Arma 3 sends you to war.
ActionSimulationStrategy - 3

POLYGON
POLYGON is a tactical multiplayer team 1st person shooter. Using various weapons, you will battle with up to 32 players on large-scale maps. Properly managing your arsenal and skills, you will lead your team to victory!
ActionEarly AccessFree To Play - 4

Arma Reforger
Engage in massive combined arms battles, create and curate combat missions in real time, and shape your experience with endless community mods. Deploy into the Cold War and experience the most authentic and immersive military sandbox ever created.
ActionSimulationStrategy - 5

Insurgency: Sandstorm
Insurgency: Sandstorm is a hardcore tactical FPS built on lethal close-quarters combat and ruthless intensity. Every bullet count, every step matters, and teamwork is your only path to survival in the brutality of modern warfare.
Action - 6

MILITARY
MILITARY is a free to play realistic first-person military shooter. Show your skills and strategies using a huge selection of game maps and models and weapons. Join to players around the world in one of the most modern games on Steam!
ActionEarly AccessFree To Play - 7

A Total War Saga: FALL OF THE SAMURAI
Experience the dramatic conflict of samurai culture and modern weaponry between the Imperial throne and the last Shogunate in 19th century Japan.
Strategy - 8

GROUND BRANCH
From one of the developers behind the original Rainbow Six® and Ghost Recon® games, comes a thinking-man's first-person shooter featuring in-depth character and weapon customization. Take your time. Think ahead. Get the job done.
ActionEarly AccessIndie - 9

Zero Hour
Zero Hour is a tactical FPS with online team-based game play that takes place in a variety of fictional locations interpreted in Bangladesh with Real-life scale & resource management. It brings a grounded, close quarter combat experience to the game.
ActionSimulationStrategy - 10

Day of Infamy
Experience close-quarters battles in iconic WWII settings. Defend the line, storm the beach, torch the enemy, or use a radio to call in fire support. Day of Infamy is a teamwork-oriented shooter that will keep you on your toes and coming back for more with its diverse game modes and authentic arsenal.
ActionIndieStrategy - 11

Steel Division: Normandy 44
Steel Division: Normandy is a tactical real-time strategy (RTS) game that pits players against AI enemies in a single-player campaign -- or against several opponents in massive 10-on-10 multiplayer battles.
ActionSimulationStrategy - 12

Steel Division 2
Steel Division 2 is a historically-accurate WW2 real-time strategy game set on the Eastern Front. Features 1:1-scale turn-based army management and real-time tactical battles with thousands of men at your order.
ActionIndieSimulation
About imho.run
imho.run is a Steam game recommender that combines collaborative filtering (ALS / iALS / EASE / LightGCN) with content-based scoring over genres, categories, Steam tags, developers, and publishers, plus AI-extracted gameplay vibes from review text. The lists you see here are generated in seed mode — anchored on Operation: Harsh Doorstop— so they answer the question “what plays like this?” rather than “what fits my library?”
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