IMHO.

Single-player games like Fortified

Below are 10 single-player Steam games similar to Fortified, 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 Fortified page.

Ranked picks

  1. 1
    MannyTD — Steam game cover

    MannyTD

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    Manny TD is a hybrid tower defense and third-person shooter with random in game elements. Join and get your personal high score!

    2022ActionStrategyEarly Access2.99 USDSingle-playerSimilar games →
  2. 2
    Scorpion Overdrive — Steam game cover

    Scorpion Overdrive

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    Descend to an alien planet where you will steal the planets most valuable resource, while hordes of giant alien bugs sting, stab, claw and shock you to no end. You must hold them back from destroying the equipment and somehow stay alive to enjoy a nice payday.

    2022ActionStrategyIndie0.99 USDSingle-playerSimilar games →
  3. 3
    Sanctum 2 — Steam game cover

    Sanctum 2

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence.

    2013ActionStrategyIndie14.99 USDDeck VerifiedSingle-playerSimilar games →
  4. 4
    Orcs Must Die! 2 — Steam game cover

    Orcs Must Die! 2

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    You’ve tossed, burned and sliced them by the thousands – now orcs must die more than ever before! Grab a friend and slay orcs in untold numbers in this sequel to the 2011 AIAS Strategy Game of the Year from Robot Entertainment.

    2012ActionStrategyIndie14.99 USDDeck PlayableSingle-playerSimilar games →
  5. 5
    McDROID — Steam game cover

    McDROID

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    Farm, Build, Defend, in the Galaxy's only Arcade-Tower-Defense.

    2014ActionStrategyIndie9.99 USDDeck PlayableSingle-playerSimilar games →
  6. 6
    Iron Brigade — Steam game cover

    Iron Brigade

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    Join The Mobile Trench Brigade and protect humanity from the evil Monovision menace!

    2012ActionStrategy14.99 USDSingle-playerSimilar games →
  7. 7
    X-Morph: Defense — Steam game cover

    X-Morph: Defense

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    Unique fusion of a top-down shooter and tower defense strategy. You are the invader! Use destructive weapons or lead your enemies into a maze of towers. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle.

    2017ActionStrategyIndie3.99 USDDeck PlayableSingle-playerSimilar games →
  8. 8
    Earth Defense Force: Insect Armageddon — Steam game cover

    Earth Defense Force: Insect Armageddon

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action with Fortified.

    Thousands of giant insects and aliens once again ravage the earth, and only the Earth Defense Force can stop them.

    2011Action9.99 USDDeck VerifiedSingle-playerSimilar games →
  9. 9
    Sanctum — Steam game cover

    Sanctum

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    You think Tower Defense games are all about building? You thought wrong. Sanctum is not your average Tower Defense title. When the havoc starts, you get to join the fray! As one of the world’s first First Person Shooter - Tower Defense games, Sanctum has taken the best of both worlds to deliver an epic, one-of-a-kind experience.

    2011ActionStrategyIndie9.99 USDDeck PlayableSingle-playerSimilar games →
  10. 10
    Orcs Must Die! — Steam game cover

    Orcs Must Die!

    Single-player alternative to Fortified — playable solo, no multiplayer required. Shares Action and Strategy with Fortified.

    Slice them, burn them, skewer them, and launch them - no matter how you get it done, orcs must die in this fantasy action-strategy game from Robot Entertainment.

    2011ActionStrategyIndie9.99 USDDeck PlayableSingle-playerSimilar games →