Left 4 Invasion: Outer Space!

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  • 10 Chapters
  • 5 Multiple Endings
  • Unusual Secrets
  • Valves Official Chapters
  • Friends or Solo-able


  • Emersonrick

    Posted this review



    I'm honestly surprised by such creativity in this campaign.
    Look, if this campaign has any flaws, it must be in the players, because everything is perfect, using parts of the original maps modified making them like abandoned places was spectacular.
    Going in reverse paths and discovering rooms that on the original maps we can't enter was an incredible experience.
    The amount of hordes was quite extraordinary, but the amount of supplies and weapons, ammo and items was also magnificent, please don't ever change that.
    Nihilant at the end was really fun, hard, but really fun.
    I loved every map in this campaign.
    I only got the ending destroying the Earth, but I don't see a problem with that because my fun was 100%
    Congratulations and Thank you!

    This review was posted before the latest release.

Audio Available

Developers & Credits

  • Sir Jay


  • NeoLin


  • Tsumugi Shirogane

    Earth Model

  • Valve

    Original Chapters

  • iamDeanPC


File Details


(300.6 MB)

View Changelog

Version 5.5 Final

  • 4 Maps
    Pick a Gnome

    Pick up a gnome to activate items. Count the number of gnomes on the loading screen to activate a gate in map 1, without consequences. 12/2/2023 10:15am Added different populations to each map. Fixed a few issues.

    • Updated
  • Mod
    Only Aether Gazer Zenkibo Tengu CF Zoey (request)

    Only Aether Gazer Zenkibo Tengu CF Zoey (request) Aether Gazer (2022) Zenkibo Tengu, Clasing Flame Skin. Replaces all survivors L4D1(bill,francis,louis,zoey),L4D2 (nick,coach,ellis,rochelle) Skin. Zoey voice support works Credit...

    • New
  • Mod
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  • Guide
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    In versus singleplayer (offline), there's a secret cheats or hack that I wanted to share with. It's "jointeam". The "jointeam" allow you to choose which team you wanted to play. Types of "jointeam": "There are 3 type of jointeam" -"jo...

  • 4 Maps
    Back to Gas Haven - night (R2L ONLY)

    There couldn't have been a worse time to run out of fuel. Fortunately there's a gas station a few miles back. But unfortunately, that's a few miles through the open desert and the people dwelling out there aren't known to be kind to trav...