Best Base Building Games Under $20

The 25 highest-rated base building games you can get for under $20, ranked by Steam reviews, with the cheapest key across 21 stores.

  1. #198% of 118,019 Steam reviews
    Factorio game key cover art

    Factorio

    $35.00 -46%
    $18.76
    difmark & 19 stores
    2020
    AutomationBase BuildingResource Management
    Steam98%
    Achieve88
    Deckplatinum
  2. #296% of 60,956 Steam reviews
    Cult of the Lamb game key cover art

    Cult of the Lamb

    $24.99 -65%
    $8.70
    driffle & 22 stores
    2022
    Base BuildingAction RoguelikeCute
    Steam96%
    Achieve57
    Deckplatinum
  3. #396% of 49,501 Steam reviews
    Oxygen Not Included game key cover art

    Oxygen Not Included

    $24.99 -95%
    $1.07
    eneba & 9 stores
    2019
    Colony SimBase BuildingSurvival
    Steam96%
    Achieve51
    Deckplatinum
  4. #496% of 37,709 Steam reviews
    Planet Crafter game key cover art

    Planet Crafter

    $23.99 -41%
    $14.09
    gamivo & 4 stores
    2024
    Base BuildingOpen World Survival CraftSurvival
    Steam96%
    Achieve55
    Deckgold
  5. #596% of 24,681 Steam reviews
    Dyson Sphere Program game key cover art

    Dyson Sphere Program

    $19.99 -19%
    $16.12
    g2a & 6 stores
    2021
    AutomationSpaceBase Building
    Steam96%
    Achieve128
    Deckgold
  6. #695% of 62,045 Steam reviews
    Age of Empires II: Definitive Edition game key cover art

    Age of Empires II: Definitive Edition

    $34.99 -68%
    $11.09
    gamivo & 21 stores
    2019
    StrategyRTSCity Builder
    Steam95%
    Achieve370
    Deckgold
  7. #796% of 8,406 Steam reviews
    Shapez game key cover art

    Shapez

    $9.99 -97%
    Historic Low $0.25
    kinguin & 24 stores
    2020
    AutomationBase BuildingResource Management
    Steam96%
    Achieve45
    Deckgold
  8. #897% of 5,992 Steam reviews
    Supreme Commander: Forged Alliance game key cover art

    Supreme Commander: Forged Alliance

    $12.99 -60%
    $5.19
    indiegala & 16 stores
    2007
    StrategyRTSSci-fi
    Steam97%
    Deckgold
  9. #995% of 19,111 Steam reviews
    Against the Storm game key cover art

    Against the Storm

    $29.99 -89%
    $3.02
    driffle & 29 stores
    2023
    StrategySimulationCity Builder
    Steam95%
    Achieve80
    Deckplatinum
  10. #1097% of 2,891 Steam reviews
    Rusted Warfare game key cover art

    Rusted Warfare

    $4.99
    steam
    2017
    RTSStrategyBase Building
    Steam97%
    Deckplatinum
  11. #1195% of 10,835 Steam reviews
    Empires of the Undergrowth game key cover art

    Empires of the Undergrowth

    $29.99 -84%
    $4.76
    driffle & 22 stores
    2024
    StrategySimulationBase Building
    Steam95%
    Achieve186
    Deckplatinum
  12. #1295% of 9,791 Steam reviews
    Mindustry game key cover art

    Mindustry

    $9.99 -23%
    $7.64
    gamivo & 17 stores
    2019
    AutomationBase BuildingTower Defense
    Steam95%
    Achieve87
    Deckplatinum
  13. #1397% of 1,478 Steam reviews
    From Glory To Goo game key cover art

    From Glory To Goo

    $11.99 -73%
    $3.23
    g2a & 3 stores
    2024
    StrategyRTSTower Defense
    Steam97%
    Achieve46
    Deckgold
  14. #1495% of 5,589 Steam reviews
    Warhammer 40,000: Dawn of War game key cover art

    Warhammer 40,000: Dawn of War

    $14.99 -62%
    $5.60
    kinguin & 36 stores
    2004
    StrategyRTSBase Building
    Steam95%
    Deckplatinum
  15. #1597% of 1,190 Steam reviews
    Impossible Creatures game key cover art

    Impossible Creatures

    $9.99 -92%
    $0.73
    kinguin & 13 stores
    2002
    StrategyRTSSingleplayer
    Steam97%
    Deckplatinum
  16. #1695% of 2,994 Steam reviews
    Turing Complete game key cover art

    Turing Complete

    $19.99
    steam & 1 store
    2021
    HardwareLogicAutomation
    Steam95%
    Achieve10
    Deckplatinum
  17. #1793% of 8,892 Steam reviews
    Forts game key cover art

    Forts

    $14.99 -67%
    $4.93
    gamivo & 23 stores
    2017
    Base BuildingMultiplayerStrategy
    Steam93%
    Achieve68
    Deckgold
  18. #1896% of 1,055 Steam reviews
    Patch Quest game key cover art

    Patch Quest

    $14.99 -96%
    $0.52
    GameSeal & 22 stores
    2023
    AdventureCreature CollectorRoguelite
    Steam96%
    Achieve27
    Deckgold
  19. #1995% of 1,806 Steam reviews
    Aethus game key cover art

    Aethus

    $19.99 -30%
    $13.99
    steam & 1 store
    2026
    SurvivalBase BuildingStory Rich
    Steam95%
    Achieve40
  20. #2094% of 2,369 Steam reviews
    Evil Genius game key cover art

    Evil Genius

    $9.99 -91%
    $0.82
    k4g & 17 stores
    2004
    Base BuildingStrategyVillain Protagonist
    Steam94%
    Deckplatinum
  21. #2195% of 1,476 Steam reviews
    Nova Roma game key cover art

    Nova Roma

    $29.99 -53%
    $13.92
    driffle & 21 stores
    2025
    StrategySimulationCity Builder
    Steam95%
    Achieve36
    Deckplatinum
  22. #2294% of 1,534 Steam reviews
    Beltmatic game key cover art

    Beltmatic

    $6.99
    steam
    2024
    AutomationCasualBase Building
    Steam94%
    Achieve10
    Deckplatinum
  23. #2392% of 6,065 Steam reviews
    Halo Wars: Definitive Edition game key cover art

    Halo Wars: Definitive Edition

    $19.99 -2%
    $19.44
    gamivo & 7 stores
    2017
    StrategyRTSBase Building
    Steam92%
    Achieve75
    Deckplatinum
  24. #2494% of 1,736 Steam reviews
    Whiskerwood game key cover art

    Whiskerwood

    $29.99 -66%
    $10.05
    driffle & 21 stores
    2025
    StrategySimulationCity Builder
    Steam94%
    Achieve21
    Decksilver
  25. #2592% of 4,965 Steam reviews
    Dungeons 3 game key cover art

    Dungeons 3

    $29.99 -97%
    $0.80
    gamivo & 35 stores
    2017
    StrategyVillain ProtagonistBase Building
    Steam92%
    Achieve60
    Deckplatinum
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