IMHO.

Single-player games like Invasion Of Britannia

Below are 8 single-player Steam games similar to Invasion Of Britannia, 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 Invasion Of Britannia page.

Ranked picks

  1. 1
    Koryos : Sons Of Mars — Steam game cover

    Koryos : Sons Of Mars

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Indie with Invasion Of Britannia.

    Indie UE5 Real-Time Strategy game set during Caesar’s Gallic Wars. Warfare sandbox + Ground Battles + Deep Army Upgrades. Build Strategize and Conquer.

    ActionStrategyIndieSingle-playerSimilar games →
  2. 2
    Historia Realis: Rome — Steam game cover

    Historia Realis: Rome

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Simulation with Invasion Of Britannia.

    Be a Roman in this grand strategy game with deep historical realism. Serve in the legions, run for political office, get married and educate your heirs. Make friends, outwit rivals and seduce lovers as thousands of other characters live out their own tragedies and triumphs!

    StrategySimulationRPGSingle-playerSimilar games →
  3. 3
    Monarch : Medieval Remastered — Steam game cover

    Monarch : Medieval Remastered

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Indie with Invasion Of Britannia.

    In the medieval era, assume the role of a lord and engage with other lords,develop fiefdoms, and employ strategies involving intrigue, warfare, and plunder. Expand your territory and strengthen your house lineage Or, be a god, manipulate the world? This game primarily strategic role-playing elements

    2025StrategyIndieSimulation11.99 USDDeck PlayableSingle-playerSimilar games →
  4. 4
    Shieldwall — Steam game cover

    Shieldwall

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Indie with Invasion Of Britannia.

    Shieldwall is a funny third-person tactical battle simulator with strategy elements. It allows you to feel like a squad leader right on the battlefield.

    2023ActionStrategyIndie17.99 USDDeck PlayableSingle-playerSimilar games →
  5. 5
    STRANGER SAGA -Stranger Bach and Iskiyeld's Ambition- — Steam game cover

    STRANGER SAGA -Stranger Bach and Iskiyeld's Ambition-

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Simulation with Invasion Of Britannia.

    "STRANGER SAGA" is a turn-based SRPG where you lead a resistance army against a mighty enemy force. Raise citizens into elite warriors and conquer challenging strategy battles!

    2025StrategySimulationRPG5.34 USDDeck VerifiedSingle-playerSimilar games →
  6. 6
    Three Kingdoms Mushouden — Steam game cover

    Three Kingdoms Mushouden

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Indie with Invasion Of Britannia.

    Set on the eve of the Yellow Turban Rebellion (AD 182), you can play as an original character or a historical warlord, building forces and forging alliances. Whether you choose to be a lone wanderer or rally famous generals, use your knowledge and wisdom to reshape history!

    2025StrategyIndieAdventure24.99 USDDeck PlayableSingle-playerSimilar games →
  7. 7
    Mandate Order — Steam game cover

    Mandate Order

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Indie with Invasion Of Britannia.

    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.

    2026StrategyIndieSimulation16.99 USDSingle-playerSimilar games →
  8. 8
    The Emperor and State — Steam game cover

    The Emperor and State

    Single-player alternative to Invasion Of Britannia — playable solo, no multiplayer required. Shares Strategy and Indie with Invasion Of Britannia.

    The Emperor and State is a turn-based strategy game that simulates the rule of an ancient feudal monarch. It involves the administration, policy adjustment, diplomatic checks and balances, national wars, as well as the emperor's self-cultivation, the cultivation of successors and so on.

    2024StrategyIndieSimulation9.74 USDDeck PlayableSingle-playerSimilar games →