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Outpost: Infinity Siege

Also known as Outpost: Infinity Siege, ois, outpost infinity siege

Command Mobile Outpost and take XEN Firearm to venture deep into the Signet surveillance off-limit area. Collect unique Weapon Units. Amp up the firepower of the Outpost that fights with you. This is an FTD game - FPS, Tower Defense, Base Building and much more all at the same time.

Last update
20 May 2026
Players now
88
Original sources
1
Latest update
Announcement

Update on Original Soundtrack for

Dear Commanders, Thank you for your tremendous support and enthusiasm for the Original Soundtrack of Outpost: Infinity Siege. We regret to inform you that, due to copyright reasons, a selection of tracks will be removed…

1 changeGameplay
Latest updates

Update history

Browse past updates and patch notes for this game.

20updates

Gallery

In-game media

Achievements

Community progression

Top picks from 26 Steam achievements, sorted by player unlock rates.

  • Operation StarfallClear level [Into the Abyss] for the first time.93.8%
  • SlayerHidden83.6%
  • New ArrivalClear level [Outpost 11] for the first time.83.3%
  • FlashHidden59.8%
  • Moving FortressReach an Outpost value of 10000.57.1%
  • Wasteland HoarderRecover items worth 3000R in a single Recovery.54.1%