IMHO.

Single-player games like TRI.DEFENDER

Below are 9 single-player Steam games similar to TRI.DEFENDER, 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 TRI.DEFENDER page.

Ranked picks

  1. 1
    Frequent Flyer — Steam game cover

    Frequent Flyer

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Complete tasks and survive the oncoming enemy waves for as long as possible! Are you good enough? Are you a frequent flyer?

    2017ActionIndieCasual0.99 USDSingle-playerSimilar games →
  2. 2
    Fiery Disaster — Steam game cover

    Fiery Disaster

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Test your mind with this twist on a Tower Defense genre, wrapped up in a deep, dark story! Play as a scientist punishing ignorant peasants with burning balls of lava!

    2016ActionStrategyIndie1.99 USDSingle-playerSimilar games →
  3. 3
    BomberZone — Steam game cover

    BomberZone

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    The classic maze based strategic bombing game is back. Earth is invaded by aliens and you are in charge of your robotic soldier to defend it.

    2016ActionIndieCasual6.99 USDSingle-playerSimilar games →
  4. 4
    Galactic Missile Defense — Steam game cover

    Galactic Missile Defense

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Galactic Missile Defense is a shooter and tower defense game, where you must protect Earth from the invading Martians that declared war on our planet just because a space rover accidentally ruined their picnic!

    2017ActionStrategyIndie0.55 USDSingle-playerSimilar games →
  5. 5
    Endorlight — Steam game cover

    Endorlight

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Endorlight is rogue-like game in which you have to find a way out to the next level. Each level contains a new and tougher enemies. Used your axe, bow or whip to defeat them! Collect gold, goes to higher levels and kill many enemies as possible and be the best on Steam Leaderboar

    2016ActionIndieAdventure0.99 USDSingle-playerSimilar games →
  6. 6
    Shadow Ninja: Apocalypse — Steam game cover

    Shadow Ninja: Apocalypse

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Fast 2D ninja action where every mistake costs everything. Run, dodge, attack and survive as long as you can.

    2015ActionStrategyIndie4.99 USDDeck PlayableSingle-playerSimilar games →
  7. 7
    Monaco: What's Yours Is Mine — Steam game cover

    Monaco: What's Yours Is Mine

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Monaco: What's Yours Is Mine is a single player or co-op heist game. Assemble a crack team of thieves, case the joint, and pull off the perfect heist.

    2013ActionStrategyIndie14.99 USDDeck PlayableSingle-playerSimilar games →
  8. 8
    Tooth and Tail — Steam game cover

    Tooth and Tail

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Lead the revolution with an army of flamethrowing Boars, mustard gas-lobbing Skunks, and paratrooper-puking Owls. Tooth and Tail is a Real-Time-Strategy game featuring Single Player, Online Competitive Play, Split Screen, Replays, and more. Build a base, lead your army, eat your enemies!

    2017ActionStrategyIndie19.99 USDDeck PlayableSingle-playerSimilar games →
  9. 9
    Bermuda - Lost Survival — Steam game cover

    Bermuda - Lost Survival

    Single-player alternative to TRI.DEFENDER — playable solo, no multiplayer required. Shares Action and Indie with TRI.DEFENDER.

    Survivors, Adventurers, Explorers! Prepare for the journey of your life and experience one of the world’s most mysterious regions! The Bermuda Triangle is notorious for the vanishing of countless ships and airplanes. Will you survive long enough to reveal its secret?

    2020ActionStrategyIndieSingle-playerSimilar games →