Best Sci-fi Games Under $5

The 25 highest-rated sci-fi games you can get for under $5, ranked by Steam reviews, with the cheapest key across 21 stores.

  1. #195% of 46,933 Steam reviews
    FTL: Faster Than Light game key cover art

    FTL: Faster Than Light

    $9.99 -69%
    $3.04
    driffle & 19 stores
    2012
    RoguelikeSpaceStrategy
    Steam95%
    Achieve51
    Deckplatinum
  2. #295% of 17,130 Steam reviews
    The Talos Principle game key cover art

    The Talos Principle

    $29.99 -88%
    $3.40
    driffle & 30 stores
    2014
    PuzzlePhilosophicalFirst-Person
    Steam95%
    Achieve40
    Deckplatinum
  3. #397% of 3,482 Steam reviews
    Metal Garden game key cover art

    Metal Garden

    $5.99 -32%
    $4.03
    kinguin & 7 stores
    2025
    AtmosphericFPSSci-fi
    Steam97%
    Achieve9
    Deckpending
  4. #495% of 13,529 Steam reviews
    Half-Life: Opposing Force game key cover art

    Half-Life: Opposing Force

    $4.99
    steam & 3 stores
    1999
    FPSActionClassic
    Steam95%
    Deckplatinum
  5. #596% of 10,050 Steam reviews
    Star Wars: Republic Commando game key cover art

    Star Wars: Republic Commando

    $9.99 -51%
    $4.82
    driffle & 16 stores
    2005
    FPSActionTactical
    Steam96%
    Deckplatinum
  6. #697% of 3,856 Steam reviews
    Arctic Eggs game key cover art

    Arctic Eggs

    $9.99 -93%
    $0.68
    k4g & 12 stores
    2024
    CookingSurrealPhysics
    Steam97%
    Achieve16
    Deckplatinum
  7. #797% of 2,484 Steam reviews
    X-COM: UFO Defense game key cover art

    X-COM: UFO Defense

    $4.99 -98%
    $0.09
    GameSeal & 19 stores
    1994
    StrategyClassicTurn-Based Strategy
    Steam97%
    Deckgold
  8. #896% of 3,425 Steam reviews
    Defense Grid: The Awakening game key cover art

    Defense Grid: The Awakening

    $9.99 -67%
    $3.29
    loaded & 11 stores
    2008
    Tower DefenseStrategySci-fi
    Steam96%
    Achieve87
    Deckgold
  9. #996% of 2,549 Steam reviews
    Total Annihilation game key cover art

    Total Annihilation

    $4.99
    steam & 1 store
    1997
    RTSStrategyClassic
    Steam96%
    Deckplatinum
  10. #1094% of 17,961 Steam reviews
    Star Wars: Knights of the Old Republic II - The Sith Lords game key cover art

    Star Wars: Knights of the Old Republic II - The Sith Lords

    $9.99 -76%
    $2.33
    GameSeal & 17 stores
    2005
    RPGStory RichSci-fi
    Steam94%
    Achieve57
    Deckgold
  11. #1193% of 25,091 Steam reviews
    XCOM: Enemy Unknown game key cover art

    XCOM: Enemy Unknown

    $14.99 -97%
    $0.41
    GameSeal & 39 stores
    2012
    Turn-Based StrategyTacticalStrategy
    Steam93%
    Achieve85
    Deckgold
  12. #1294% of 11,716 Steam reviews
    Dome Keeper game key cover art

    Dome Keeper

    $17.99 -86%
    $2.34
    GameSeal & 38 stores
    2022
    SingleplayerPost-apocalypticRoguelike
    Steam94%
    Achieve47
    Deckplatinum
  13. #1394% of 6,467 Steam reviews
    Citizen Sleeper game key cover art

    Citizen Sleeper

    $19.99 -97%
    $0.50
    kinguin & 20 stores
    2022
    RPGStory RichDice
    Steam94%
    Achieve27
    Deckplatinum
  14. #1492% of 26,961 Steam reviews
    Alien: Isolation game key cover art

    Alien: Isolation

    $39.99 -91%
    $3.37
    k4g & 32 stores
    2014
    HorrorSurvival HorrorSci-fi
    Steam92%
    Achieve50
    Deckplatinum
  15. #1594% of 3,434 Steam reviews
    The Swapper game key cover art

    The Swapper

    $14.99 -84%
    $2.28
    gamivo & 12 stores
    2013
    PuzzleSci-fiAtmospheric
    Steam94%
    Achieve10
    Deckgold
  16. #1693% of 10,136 Steam reviews
    Half-Life: Blue Shift game key cover art

    Half-Life: Blue Shift

    $4.99
    steam & 3 stores
    2001
    FPSActionSci-fi
    Steam93%
    Deckplatinum
  17. #1793% of 8,000 Steam reviews
    Warhammer 40,000: Mechanicus game key cover art

    Warhammer 40,000: Mechanicus

    $29.99 -95%
    $1.26
    driffle & 34 stores
    2018
    StrategyTurn-Based TacticsTurn-Based Combat
    Steam93%
    Achieve34
    Deckgold
  18. #1893% of 3,605 Steam reviews
    Thomas Was Alone game key cover art

    Thomas Was Alone

    $9.99 -94%
    Historic Low $0.57
    kinguin & 9 stores
    2012
    PlatformerSide ScrollerSci-fi
    Steam93%
    Achieve35
    Deckplatinum
  19. #1995% of 1,277 Steam reviews
    Analogue: A Hate Story game key cover art

    Analogue: A Hate Story

    $9.99 -83%
    $1.61
    kinguin & 8 stores
    2012
    Visual NovelAnimeIndie
    Steam95%
    Achieve14
    Deckplatinum
  20. #2091% of 22,310 Steam reviews
    Prey game key cover art

    Prey

    $29.99 -88%
    $3.37
    driffle & 26 stores
    2017
    Sci-fiImmersive SimSpace
    Steam91%
    Achieve58
    Deckplatinum
  21. #2194% of 1,406 Steam reviews
    Overload game key cover art

    Overload

    $29.99 -96%
    $1.06
    kinguin & 14 stores
    2018
    6DOFActionFPS
    Steam94%
    Achieve50
    Deckplatinum
  22. #2291% of 22,477 Steam reviews
    Star Wars: Knights of the Old Republic game key cover art

    Star Wars: Knights of the Old Republic

    $9.99 -79%
    $2.05
    driffle & 23 stores
    2003
    RPGSci-fiStory Rich
    Steam91%
    Deckgold
  23. #2393% of 2,399 Steam reviews
    Rings of Saturn game key cover art

    Rings of Saturn

    $9.99 -91%
    $0.82
    difmark & 10 stores
    2023
    SpaceSci-fiPhysics
    Steam93%
    Achieve90
    Deckplatinum
  24. #2495% of 916 Steam reviews
    Technobabylon game key cover art

    Technobabylon

    $14.99 -73%
    $3.96
    kinguin & 11 stores
    2015
    Point & ClickAdventureCyberpunk
    Steam95%
    Achieve40
    Deckplatinum
  25. #2591% of 13,559 Steam reviews
    Deus Ex: Human Revolution game key cover art

    Deus Ex: Human Revolution

    $19.99 -90%
    Historic Low $1.85
    kinguin & 12 stores
    2011
    CyberpunkStealthRPG
    Steam91%
    Achieve59
    Deckgold
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