Single-player games like Siege of Irdor
Below are 8 single-player Steam games similar to Siege of Irdor, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Siege of Irdor page.
Ranked picks
- 1
Diplomacy is Not an Option: Shareware
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy and Simulation with Siege of Irdor.
Diplomacy is Not an Option: Shareware is a free prequel to the original game. In a medieval fantasy world, you are to build settlements, raise huge armies, and defend against massive hordes of enemies. Learn how Ironbrow clan shaped the world's map the first time - if you survive, that is.
- 2
Lessaria: Fantasy Kingdom Sim
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Irdor.
Lessaria is an RTS inspired by Majesty 👑 where you guide heroes with indirect control. Play through the campaign or relax in sandbox mode as you build your magical kingdom.
- 3
Mandate Order
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Irdor.
Mandate Order is a Warring States war city-builder set in ancient China. Build a stronghold, manage industries and logistics, recruit scholars from the Hundred Schools of Thought, raise armies, and command real-time tactical battles with thousands of soldiers.
- 4
Here Comes The Swarm
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Irdor.
Here Comes the Swarm is a survival RTS with a pause button! Create your strategy, build, manage, and defend your settlements at your own pace. Take the fight to the hive mind and lead expeditions to deliver a deadly blow and eradicate your foes. Will you reclaim Ulora from the relentless Swarm?
- 5
Corsair Cove
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy and Simulation with Siege of Irdor.
Build a sprawling pirate haven, raise a fleet to explore the high seas, and take on the Crown to keep the Age of Piracy alive! From ale to flintlock pistols, and from scallywags to swashbucklers, you’ll need to manage complex production chains and govern a rowdy crew to reign supreme over the seas!
- 6
Gold Gold Adventure Gold
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Irdor.
In this world, it’s all about the gold! Use it to build up a fantasy town, recruit heroes, give quests, raise a Godbeast, cast powerful spells, and expand your influence—all one gold coin at a time.
- 7
DarkSwitch
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy with Siege of Irdor.
DarkSwitch is a vertical survival city builder. Build a city on a great tree and defend it against the Fog. Face the challenges of limited real estate, scarce resources, and tough moral choices as you seek to uncover the mystery of the Shroud. The Tree Provides! The Tree Protects! The Tree Prevails!
- 8
Stronghold: Definitive Edition
Single-player alternative to Siege of Irdor — playable solo, no multiplayer required. Shares Strategy and Simulation with Siege of Irdor.
Greetings sire! Your stronghold awaits you. Build a castle economy, besiege unforgettable villains and return to the 'castle sim' that started it all. Experience this classic RTS with upgraded visuals, modernised gameplay, Steam multiplayer and a new campaign.