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Interstellar Marines resurrects the old school tactical FPS, offering a unique blend of co-op, role-playing and nonlinear gameplay. Set in a believable future, you take on the role as an elite soldier handpicked to join Project IM, a top secret military program being assembled to protect mankind from all dangers outside our solar system.
Release Date: Jul 2, 2013
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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game may or may not change significantly over the course of development. If you are not excited to play this game in its current state, then you may want to wait until the game progresses further in development. Learn more

What the developers have to say:

“We're a small team pouring our blood, sweat and tears into delivering an FPS that merges the best from tactical shooters with believable science fiction and role-playing-- think Half-Life meets System Shock, giving birth to Rainbow Six in space!

By purchasing Early Access to Interstellar Marines, you’re actively supporting the development of the game, and as we release frequent updates we invite you to give your feedback and suggestions to help us create the best game possible.”
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Buy Interstellar Marines

Early Access to Interstellar Marines, including all future updates and expansions.


Buy Interstellar Marines - Spearhead Edition

Early Access to Interstellar Marines including all future updates and expansions + Join the Spearhead unit (unique honorary game profile) + Your username in the Hall of Honor and your name in the credits of the game + Digital download of the Interstellar Marines: The Beginning soundtrack and all future soundtracks + Digital download of art book when it’s ready + Get 1 extra Interstellar Marines Steam Key to gift to a friend.


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Interstellar Marines - Spearhead Edition Upgrade


Recent updates View all (16)

Linux Maintenance Patch

July 8th, 2014

Linux Maintenance Patch

We've released a small patch today which fixes the mouse stutter issues many of our Linux players have been experiencing. Please let us know if this patch works for you!

Linux Maintenance Patch July 8th, 2014
Version: 0.5.12
Released: 8th of July 2014


UPDATED: Unity to 4.5.1p4


FIXED: "Mouse stuttering in Linux clients"

Your team at Zero Point Software

8 comments Read more

Update 12: Available on Linux

June 6th, 2014

Update 12: Available on Linux

Update 12 introduces our first Linux client, along with numerous deep improvements to the Deadlock game mode which hugely extend gameplay. Click to watch the update video.

Update 12
Version: 0.5.12
Released: 6th of June 2014

What's New

ADDED: Linux client
ADDED: New first person spectator mode when waiting for respawn in Deadlock
ADDED: Immediate spawning into Deadlock when first joining a server (120s delay if player leaves and returns before match end)
ADDED: Round logic. Matches are now first side to three rounds, with the winner required to win by 2 rounds.
ADDED: New levelcam overlay which shows Team Point rewards for various actions
ADDED: Ability to create Spearhead-only servers to allow Spearheads to test early versions of new updates
ADDED: Additional reflection effect to helmet


UPDATED: Changed scoring to reflect the number of rounds won per side
UPDATED: Helmet closes when a player spawns in to enhance immersion
UPDATED: Several additional messages to provide more information to the player
UPDATED: Updated to Unity 4.5
UPDATED: Music plays on match end
UPDATED: Several map fixes
UPDATED: New tutorials added to the YouTube playlist

Known Issues

-The HUD names and kill messages will be clipped on aspect ratios that are less wide than 16:10
-Footstep audio and FX does not work on terrain (known bug in Unity 4.3)
-Third-person jump animations does not work correctly yet
-The game will stop updating when switching out of fullscreen in Windows (known bug in Unity 4.3)
-View jittering may occur when jumping on lossy networks
-Audio may cut off partially/completely on weapon/helmet sounds
-Other players will seem to float above or interpenetrate while standing on a moving dynamic platforms (network smoothing will exaggerate this effect)
-Mainline and Mainline Winter maps have been temporarily removed from menu
-TPs are not awarded for winning or finishing a match


FIXED: "TP stealing when more than one player is capturing a zone"
FIXED: "Pressing space to join bug"
FIXED: "Flashlight and laser indicators not working on AR 03 Assault Rifle"

Your team at Zero Point Software

67 comments Read more
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Report bugs and leave feedback for this game on the discussion boards

Interstellar Marines

Purchase Interstellar Marines and receive the following:

  • Early Access – be part of the development of Interstellar Marines and provide your feedback and suggestions as we expand the game update after update.
  • All In – receive all future updates and expansions completely free of charge.

Interstellar Marines - Spearhead Edition

In addition to Early Access to Interstellar Marines (including all future updates and expansions), the Spearhead Edition includes:

  • Access to Beta Builds of New Updates – Spearhead owners receive access to early beta builds of new updates before they're released publicly, allowing you to test out new content in advance.
  • Spearhead identity – A unique honorary game profile that with time will grant you access to special skins, helmets, weapons etc. (does not alter gameplay).*
  • Hall of Honor & Credits – Your name will be acknowledged in a special in-game Hall of Honor and you’ll also get your name in the credits.*
  • Digital Soundtracks – Download the Interstellar Marines: The Beginning soundtrack as well as all future soundtracks as they are released.
  • Digital Art Books – Download digital PDFs released periodically, filled with high resolution concept art, screenshots and behind the scenes information.*
  • Extra Steam Key – You’ll receive an additional copy of Interstellar Marines to trade or gift to a friend.
*Not available yet

Steam Greenlight

About the Game

Now Available For Linux! Interstellar Marines resurrects the old school tactical FPS, offering a unique blend of co-op, role-playing and nonlinear gameplay. Set in a believable future, you take on the role as an elite soldier handpicked to join Project IM, a top secret military program being assembled to protect mankind from all dangers outside our solar system.

Interstellar Marines is inspired by Half-Life, System Shock 2 and Rainbow Six 3: Raven Shield. Our game is all about evolving the FPS recipe with all the inspirations we've assimilated since the birth of the genre. Our goal is an evolutionary leap forward driven by our compulsive interest in science fiction, role-playing, military realism, and respect for first person immersion.

Features Currently Available

  • 8 unique indoor and outdoor maps featuring dynamic environment configurations such as time of day, rain, thunder and lightning, emergency lighting, fire alarms, movable platforms etc.
  • 100% dynamic lighting and real-time shadows as well as destructible light fixtures.
  • Full-body first person character simulation (no more floating hands!) with a physics-based dynamic character controller.
  • Advanced and intuitive crouch and cover system.
  • Physically present combat helmet with futuristic HUD projected onto the inside of the visor glass and affected by light and rain.
  • Deadlock game mode (5vs5 and 8vs8) in highly dynamic environments.
  • Full spectator and movie mode with freecam, first and third person views. Record movies, livestream, and cast matches.
  • Experience various maps and prototypes in “Playground” mode (singleplayer).
  • Play on high capacity dedicated servers in the US, Europe, Australia, Russia and Brazil.
  • Submachine Gun (CE6) with full-auto fire.
  • Shoot from hip or look through the Red Dot scope for increased accuracy.
  • Toggleable tactical flashlight for when it’s pitch black.
  • Toggleable laser to assist your aim (no crosshairs)
  • Smooth network play even on high latency connections with packet loss.
  • Realistically simulated ragdolls with momentum transfer.
  • Training Rank Steam Achievement.

Vision of Interstellar Marines

  • First Person Simulation
    A razor-sharp focus on creating a truly immersive First Person Simulator via distinct graphics, audio and gameplay.
  • Tactical Co-op
    The entire game experience designed from the ground up to support up to 4 players in co-op, with true cooperative interaction.
  • Progressive Role-Playing
    Flat and classless progressive character development and skill system that is not dumbed down for consoles.
  • Nonlinear Game Design
    Open and dynamic game world that always presents a multitude of tactical options for navigating the environment.
  • Customizable Arsenal
    A comprehensive selection of weapon models and types, extension upgrades and equipment options, allowing on-the-fly choice in each tactical situation.
  • Thinking AI
    Enemies that react to input from you and the surrounding game world. We would rather have one smart thinking enemy than five stupid ones.
  • Believable Science Fiction
    Realistic and rich sci-fi environments, ranging from claustrophobic space stations to large outdoor worlds.
  • Interactive Storyline
    A cinematic narrative centered around first contact with another sentient species, where your choices and actions will have consequences.

    Roadmap (Near Future)

    In no particular order:
    • Steam features (stats, achievements, friends).
    • Advanced character movement (sprint to be added).
    • Tactical gameplay (fatigue and adrenaline).
    • Co-op features (multiplayer).
    • Weapon features (rate-of-fire, extensions, reload types).
    • Extend general game UI and HUD system.
    • In-game profiles.
    • More weapon types and models.
    • New multiplayer maps.
    • Environment variations, theme and context.
    • Shooting range (singleplayer).
    • Developer Commentary mode.
    • Oculus Rift support.
    • Server / LAN support.
    • Artificial Intelligence (AI).

    Your team at Zero Point Software

PC System Requirements

    • OS:Windows XP SP3 or Windows Vista
    • Processor:2.4 GHz Dual Core
    • Memory:2 GB GB RAM
    • Graphics:Nvidia Geforce 8800 GT / ATI Radeon HD 4770
    • DirectX®:9.0c
    • Hard Drive:1 GB HD space
    • Sound:DirectX 9.0c Compatible
    • OS:Win 7 or later
    • Processor:2.4 GHz Quad Core
    • Memory:4 GB GB RAM
    • Graphics:Nvidia Geforce GTX 280 / ATI Radeon HD 5830
    • DirectX®:9.0c
    • Hard Drive:1 GB HD space
    • Sound:DirectX 9.0c Compatible
    • Other Requirements:Broadband Internet connection

Mac System Requirements

    • OS:10.7.5 (Lion)
    • Processor:2.2 GHz Intel Core 2 Duo
    • Memory:2 GB RAM
    • Graphics:Nvidia Geforce 8800 / ATI Radeon HD 3850
    • Hard Drive:1 GB HD space
    • OS:10.8.2 (Mountain Lion)
    • Processor:2.4 GHz Intel Quad Core
    • Memory:4 GB RAM
    • Graphics:Nvidia Geforce GT 120 / ATI Radeon HD 4870
    • Hard Drive:1 GB HD space
    • Other Requirements:Broadband Internet connection

Linux System Requirements

    • OS:Linux
    • Processor:2.4 GHz Dual Core
    • Memory:2 GB GB RAM
    • Graphics:Nvidia Geforce 8800 GT / ATI Radeon HD 4770
    • Hard Drive:1 GB HD space
    • OS:Latest version of Ubuntu (14.04)
    • Processor:2.4 GHz Quad Core
    • Memory:4 GB GB RAM
    • Graphics:Nvidia Geforce GTX 280 / ATI Radeon HD 5830
    • Hard Drive:1 GB HD space
    • Other Requirements:Broadband Internet connection
Helpful customer reviews
244 of 309 people (79%) found this review helpful
79 products in account
1 review
24.4 hrs on record
Early Access Review
Interstellar Marines is a game I’ve anticipated, forgot, and then, to my great joy, rediscovered last year on Steam, fresh from being greenlit.
Unfortunately, that game I saw a few years before is still in early access stages. However, that’s not bad. On the contrary, it’s a good thing, considering all the troubles Zero Point Software has faced even trying to get it to this point. The stuff they’ve been through so far is already an inspiring tale by itself.
Note that the following is subject to change and modification as updates roll out and as I improve what I have to say, and that before you make any decisions you should go see some gameplay videos of the current version. If you don’t like my review, please, give me some feedback in the comments!

To the subject at hand, with my nostalgia and feelings aside, the current stage (Steam Update 10) that IM is at is still pretty barebones. One gun, infinite reserve ammo, plus lots of other ‘missing’ things (The truth is most are incomplete and not active yet).

HOWEVER, even at this pre-alpha stage, Interstellar Marines is a blast. The effort and care put into the game, polishing everything before release, shows so much promise and potential. I personally have never encountered a bug due to the polishing and testing they do (Unlike SOME companies!), and what they’ve got so far can rival other high-quality shooters, experience wise.

You could mistake their work for a veteran developer’s. Triple-A indie indeed!

The primary reasons for the fun I have, even with the lag my computer experiences at times (Lowest I hit was 15-ish Frames per Second) is the immersion and feel that ZPS strives so far and hard to accomplish, along with the fun (But very incomplete and sometimes infuriating) gunplay and dynamic environments.
When the lights on a map go out, there are three main conflicts on my mind. Do I turn my flashlight on, risk being spotted? Try to move in for the kill? Or do I find the darkest corner and prey on the unsuspecting?
You don’t commonly see this in full games made by big developers, such as Battlefield or Call of Duty, and when you do it’s commonly in Campaign Mode as part of a scripted event.
In this early access game, while only Multiplayer at the moment, the tension compliments the early but good gunplay, and the emerging tactical features and changes to the game show a bright future.
Since the first steam version, IM’s come along a great amount, with a fancy crouch-cover system being improved, maps being made, added, and rebalanced, with things such as new and updated maps or whole new HUDs being introduced to enhance immersion. Interstellar Marines just keeps getting better! It’s not perfect yet, but again, early access.

To sum this up, you only have one gun, and matches can degrade to shooting at eachother (Though to be honest, this is what every FPS pretty much is, shoot at the other person). However, the game pulls you in and can make things intense through the map alone, and the Domination gamemode keeps the pace up and forces people to move around, keeping the action alive and kicking.

Unfortunately, at this time it’s a bit challenging to be tactical and immersed like ZPS wants. At the moment there’s no proper teamchat, the hit detection is spotty due to bullet lag, and running can be safer than using the cover system at times. However, I’d love to disregard those until they’re properly implemented, as many things are being worked on behind the scenes every day.
As for how it runs and looks, the former is rather iffy and the latter is damned good. However, one can’t judge this so early considering that they haven’t done that many optimizations yet, and it’s very distant from a full, final release, so that may take a while. But the views are spectacular, and the graphics actually play an important part in gameplay, due to the dynamic lighting system, the fog and the storm effects.

As for the relatively small online community, with the exception of teamkillers and some new players, those I’ve seen are mature and understand the game, and you can almost always find a match going on somewhere. That, and people who don’t believe in IM tend not to fall into the mature and understanding category for me, unless they’ve proven otherwise.

As for the major story and all that, we’ll just have to wait for the future, and the Carcharodons/landsharks. Glorious landsharks! However, I can sum up what the story relates to in the game at the moment (Update 10).
Lore-wise, the multiplayer of Interstellar Marines takes place in Area 51, or ITO Dreamland, where the players are candidates for the Interstellar Marines Special Forces program.
I find this interesting and I love how the developers try to connect the MP to the story, and I like the effects the guns give off and the ‘TAZER’ notification in the HUD.

As for ZPS, you guys are dedicated, and the stuff you’re doing to connect with the community is great. Can’t wait for the future!

tl;dr, Even though it’s barebones, the fact that it’s better than some new FPS games right now = One of the best modern games for PC on the horizon, perhaps!

Now, for buying it, I'd personally recommend it to support the devs (I know they need it, for the love of the game!) and purchase it, but if you're not that into early access or 'barebones' gameplay, then you may want to wait a bit.
The price will go up, though, over time. If you're lucky you can snag a copy during a livestream at http://www.twitch.tv/zeropointsoftware or a spare to give to a friend.

NOTE, before you make any decisions, you should go see some gameplay videos of the current version, see what you like.


This is a bloody early access, and it takes time to recreate those things in Unity. Be patient, there's only 8 devs, and they want a solid multiplayer first for you, the player or potential believer! And then, only then, can they begin to focus on the landsharky goodness.

Where is the ‘First Immersion’ demo?!
It was a small publisher demo created to get them publishers back in 2007-8, demonstrating features on Unreal Engine 3. Unfortunately they can’t release it or work on it due to licensing red tape. However, Xeno-13 will be remade eventually!

My feelings on the progress of the game after so long:
They've gone through some stuff, and they hit steam with only two developers. Now, today, they're becoming able to hire more due to steam's early access, which will allow them to slowly speed up development and finally get the game out the gate.
After seeing what some of the Devs had to say, I’ve also learned that the ‘lack of progress’ some people argue is actually lots of unseen progress. You don’t see the badass ninja from that one VLog anywhere in the game because they actually fixed that BEFORE updating the game!

More/Outdated responses
I see how some complain that the game did not deliver, lied in it's advertising and all that. I say that when you look at the big picture, with all of ZPS' troubles, experiences, and traits, that the advertising was in no way false at the time it was made.
Original trailer, made to impress and to get a publisher, but from what I remember they didn’t say it was really ingame.
Space Station and Sharks gameplay, a demo built on the Unreal 3 engine to impress and get a publisher, before 2008 screwed them over.
Why does the current game look and play so differently than the demo? They can't use the Unreal 3 engine, the license costs a million bucks. That and the assets are a bit dated, and more legal tape.

There's more, but I believe this illustrates my point.
Posted: February 27th, 2014
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134 of 213 people (63%) found this review helpful
775 products in account
55 reviews
1.2 hrs on record
Early Access Review
You can't just buy this game while it is EARLY ACCESS, and then complain about bugs, insulting and without giving any constructive opinion. That really doesn't help the developers. Probably because of the same people with disgusting attitude many games were abandoned.

This is really really beta, you have only a weapon, so you can understand how beta this is.
First of all, i didn't spend much time in the game to be honest, but i can give you my opinion so far, i really think it can be helpful.

I didn't encounter any glitches like i don't know, falling through the map, so far.
The game is well optimised but sometimes i get random FPS drops, but not very often.

What can be improved:
I love the shadows and the lighting, but i think you can work a little bit more on the shadows because sometimes you can confuse them with an enemy (or it might just be me).
You could also improve the running, it feels more like sliding. (some more work on the walking wouldn't be bad either)
The shooting mechanism, it doesn't feel very exciting or real.
I love how weather changes and it starts raining, it is awesome, but since you have a helmet with some sort of face-protection i think the rain drops should slide, not just stick there.
Chat system, currently, honestly it is awful, i am pretty sure nobody likes to open a window to see the new messages from other players.
Accuracy, for some reason it is kinda weird, it happened to me to shoot an entire clip into someone and ending up by getting killed (even if i burstly shot).

So far, i am impressed with this game, at this stage of the game, i honestly expected to see through walls, fall through the map, getting stuck inside the floor, maybe application not responding. So far, you really did a good job. And don't let this game go because of idiotic people who just rant about it without giving a constructive opinion, just because they couldn't read 'Early Access'. This game can become huge! It has potential more than probably 40% of the AAA shooters.

Posted: February 14th, 2014
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24 of 31 people (77%) found this review helpful
311 products in account
32 reviews
2.7 hrs on record
Early Access Review
Early Access as hell, but what's here is enjoyable and has a lot of promise. Unlike some other Early Access games, Interstellar Marines has also been building on that promise, rather than tripping over itself constantly. It's got the best HUD in ages (A visor that actually reacts to the game world, with rain drops dripping down it, and damage eventually causing it to malfunction and no longer display friend or foe indicators. Hell, you can even open and close the visor if you want.), intense gunplay that Rainbow Six fans will instantly love, and, well, that's kind of it for now.

As much fun as being paranoid, scanning around dark rooms, flipping your flashlight on for a second before turning it off again so you don't give yourself away can be, it's not going to keep you coming back for more time and time again when all that is here is a few maps, a few modes, and two guns. A complete lack of the main focus, co-op play, is also rather jarring.

Still, if you need a Rainbow Six fix, this is already one of the best choices you can make. And while the updates aren't frequent, they've been consistently high quality. IM is a game to keep an eye on, if nothing else.
Posted: March 27th, 2014
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34 of 54 people (63%) found this review helpful
265 products in account
64 reviews
7.7 hrs on record
Early Access Review
"Feels a bit like back in the days - PLZ finish the game!"

Early Access:
This tactical sci-fi shooter is still in development and that is good, because there's still missing a lot. IM really has the chance to become an amazing "indie" AAA shooter. But the development time is quite long, especially if you take a look at it's history and the vision. Anyway right now the playable multiplayer has a great atmosphere and is worth a look (at least at the SALE price). This game has some really great potential, like stocks - but cheaper.

+ great atmosphere
+ great sounds
+ great setting
+ great 1st person view
+ good graphics
+ good controls
+ good weapon handling
+ good movement
+ light&shadows (indoors)
+ textures indoors
+ the feeling of SWAT4/RainbowSix in a sci-fi setting

- only multiplayer (right now)
- empty servers (due daytimes)
- the waiting time
- movement animations
- textures outside
- no shark enemies yet :(
- the "hope" for a 2014 release
- no SLI support (SLI Fix!)
- (really long development time)

The Multiplayer is great, the waiting time sucks, a full release would be superb... This game is too good to become a "never ending story"! Support it :)
Posted: April 5th, 2014
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57 of 99 people (58%) found this review helpful
177 products in account
17 reviews
4.7 hrs on record
Early Access Review
NOTE: if you wish to see this review in its true form check out my blog: http://wildwoodgeek2.blogspot.com/2014/03/game-reveiwinterstellar-marines.html

IM Multiplayer is very fun and the Guns have that Battlefield realism to them. Most of the Maps are your standard shooter stuff, But one sticks out. "Operations" This map goes through three modes: Normal,Alarm, and Darkness. it makes the battles fun and exciting. during the Alarm mode it is hard to aim because of all the noise and flashing lights while in darkness you can not see without using your light, and if you do you will be giving your enemies a clear pointer to where you are.

Although it is fun to play the lack of any choice when it comes to guns,armor, even your avatar's look, makes the game get old very fast. There is rarely more than one server with players on it, and sometimes when the server reaches 16 players you wont be allowed in with the game saying "Error: Server is full" even thought the limit says 18. Hopefully when the game progresses more there will be more players. The game sells for $14.99 USD. Unless you get the Spearhead version in which you get all "including all future updates and expansions". i dont understand that really, "All future updates?" you get the updates no matter what version you have... right?

Right now the game is very limited you can't crouch, go prone or do anything other than sprint and walk really. Leveling up does nothing other than giving you a steam achievement, However the Dev road map promises that and more, including O-Rift support and Linux ports.The Devs seem to be staying on top of things with updates and bug fixes, and they obliviously have big plans for their game.
if you want to invest in a small game that may one day become the PC's Halo then checkout Interstellar Marines from Zeropoint Software on Steam.
Posted: March 7th, 2014
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