Newly updated with 7 singleplayer/co-op missions, a brand new multiplayer map and vastly improved hit detection! Interstellar Marines resurrects the old school tactical FPS, offering a unique blend of co-op, role-playing and nonlinear gameplay. Play co-op or multiplayer on dedicated servers around the world.
User reviews: Mostly Positive (2,281 reviews)
Release Date: Jul 2, 2013

Sign in to add this game to your wishlist or mark as not interested

Early Access Game

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

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if 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.”
Read more

Buy Interstellar Marines

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

HOLIDAY SALE! Offer ends January 2

-25%
$18.99
$14.24

Buy Interstellar Marines 4-Pack

Get one copy for yourself and give the other three to friends!

HOLIDAY SALE! Offer ends January 2

-25%
$49.99
$37.49

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.

Buy Interstellar Marines - Upgrade to Spearhead Edition

Interstellar Marines - Spearhead Edition Upgrade

 

Recommended By Curators

"It's about a 9/10 on the "i'm going to wet my pants" scale. The co-op is pretty good!"
Read the full review here.

Recent updates View all (22)

December 17

Update 16: Assault On Starcrown Aerospace



Update 16: Assault On Starcrown Aerospace

2014 has been an incredible year for Interstellar Marines, and we want to say goodbye to it with a bang! So to make sure the holiday season is tons of fun, Update 16 includes a brand new campaign co-op map, a brand new multiplayer map AND something the community has been requesting for a long time: vastly improved hit detection. And last but not least, T-IM101 is back in Xmas Mayhem!

Update 16
Version: 0.5.16
Released: 17th December, 2014

What's New

ADDED: New Co-Op Mission Map: Starcrown
ADDED: New Dynamic Multiplayer Map based on the Astrodome framework: Dynacore
ADDED: Revive 2.0 to Multiplayer and Co-op
ADDED: First iteration of Stats viewable through the Profile tab. Note, we will need to reset this several times as we develop
ADDED: New hit detection system
ADDED: Ability for players to be admins with the ability to kick or ban
ADDED: LoD for crates
ADDED: Several AI game events
ADDED: Physics-based performance improvements

Improvements

UPDATED: Revive now has a timer
UPDATED: Xmayhem game mode to accomodate changes during the last 12 months
UPDATED: Crates and other props across several existing levels
UPDATED: TPs are now shared between players who are capturing a capture zone in Deadlock

Known Issues

- The HUD names and kill messages will be clipped on aspect ratios that are less wide than 16:10
- The game will stop updating when switching out of fullscreen in Windows (known bug in Unity 4)
- 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)
- Potential to fall through elevator when moving
- Sometimes bots will not appear in single player maps. Restart the game and they will appear

Fixes

FIXED: "Remove Team Kill penalty in co-op"
FIXED: "#1 Clan logo now shows"
FIXED: "Difficulty now shows in Get Killed By Bots"
FIXED: "Chat and kill messages now show when suit HUD down"
FIXED: "After suiciding, spawn as a spectator in the next round"
FIXED: "Railings in each map to ensure they have colliders and do not double-cast shadows"
FIXED: "Reload sound continues to play when cancelled by silencer animation"
FIXED: "Dynamic platforms in Elevation now work"
FIXED: "Numerous additional bug and performance fixes and updates"

FOR THE LOVE OF THE GAME,
Your team at Zero Point Software

35 comments Read more

November 20

Update 15: Stealth Suppressed



Update 15: Stealth Suppressed

We're back with two more co-op & singleplayer maps, as well as brand new stealth options. So suit up, and get ready to experience a more silent and tactical approach to combat.

Update 15
Version: 0.5.15
Released: 20th November, 2014

What's New

ADDED: Sound-supressor for both SMG and Assault Rifle. Sound and damage curves have been adjusted
ADDED: Survival B game mode to Colony for co-op and singleplayer gameplay
ADDED: Elimination B game mode to Mainline for co-op and singleplayer gameplay
ADDED: Ability for AI to sense how much light is falling on a Marine
ADDED: Numerous AI upgrades to enhance the AI's intelligence
ADDED: New weather state to Colony

Improvements

UPDATED: AI balance has been tweaked around the ability to see light levels
UPDATED: AI tweaked and upgraded for Defective and Guards
UPDATED: Nucleus, Stronghold and Operations to support new AI light vision
UPDATED: Mainline to make it more AI friendly and add extra cover for AI bots
UPDATED: Colony to add more cover for AI bots
UPDATED: Non-supressed sounds for the SMG and AR
UPDATED: Difficulty level is now shown in playground and Get Killed By Bots

Known Issues

- The HUD names and kill messages will be clipped on aspect ratios that are less wide than 16:10
- The game will stop updating when switching out of fullscreen in Windows (known bug in Unity 4)
- 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)
- Potential to fall through elevator when moving
- Sometimes bots will not appear in single player maps. Restart the game and they will appear
- Number 1 clan logo does not show up in the scoreboard. Current number 1 clan is -TEK-

Fixes

FIXED: "Chat not working under certain conditions"
FIXED: "Scoreboard not disappearing when HUD is down"
FIXED: "Waypoint not reappearing if you turn off a powerbox in Survival A"
FIXED: "Joining as a spectator in a Nucleus server"

FOR THE LOVE OF THE GAME,
Your team at Zero Point Software

31 comments Read more
See all discussions

Report bugs and leave feedback for this game on the discussion boards

Interstellar Marines - Regular Edition

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.
  • Digital Concept Art – You’ll receive early copies of concept art and other images in a special Spearhead folder on your hard drive.
*Not available yet

Steam Greenlight

About This Game

7 Singleplayer/Co-op Missions and 9 Unique Multiplayer Maps Available!

We now have seven singleplayer/co-op missions available to play, including the new Assault on Starcrown Aerospace and The NeuroGen Incident campaigns, which propels you into the middle of two pivotal missions inside the Interstellar Marines universe. Play singleplayer or co-op with up to three friends in intense action with more co-op, singleplayer and multiplayer missions coming soon!

Interstellar Marines resurrects the old school tactical FPS, offering a unique blend of co-op, role-playing and non-linear gameplay. Set in a believable future, you take on the role of 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

  • Singleplayer and co-op stealth campaign called Assault on Starcrown Aerospace with sandbox gameplay, randomised locations and multiple difficulty levels.
  • Massive singleplayer and co-op level titled The NeuroGen Incident.
  • 5 additional co-op and single-player challenge missions against our unscripted AI for you and your friends to test your abilities.
  • 9 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) and Assault Rifle (AR-3) 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.
  • Multiple Steam Achievements.

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)

    These are the features we are planning on adding fairly soon, and are in no particular order. Many of them have already been partially completed:
    • 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).*
    *This is already partially completed and in Interstellar Marines

    FOR THE LOVE OF THE GAME,
    Your team at Zero Point Software

System Requirements

Windows
Mac OS X
SteamOS + Linux
    Minimum:
    • 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
    Recommended:
    • 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
    Minimum:
    • 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
    Recommended:
    • 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
    Minimum:
    • 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
    Recommended:
    • 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
45 of 53 people (85%) found this review helpful
2.1 hrs on record
Posted: November 22
Early Access Review
Just keeps getting better with every update, them robots....my god...scary stuff. A lil bit overpriced considering its early access and state, but worth picking up down the line once they have gotten further into development. Really good shooter, like insurgency but with space and robots xD.
Was this review helpful? Yes No
30 of 33 people (91%) found this review helpful
207.5 hrs on record
Posted: December 4
Early Access Review
If you look at the hours I have put into this game that is pre alpha, you will see that I am continuously and thoroughly enjoying this game as it develops. I am eager to finally play the finished version no matter if it is still some time away. This game has taken me through a variety of emotions from fear, frustration, elation, and more. All of these things make it fun and challenging. It takes some time to get used to, because of some of the pre alpha anomalies. It is like a new pair of shoes. They look good, but when you try them on, they don't fit at first. After wearing them for a while they feel great and become your favorite.

Some people have problems getting used to the game, or have issues getting it running on their hardware. Just stepping over to the community with these problems and you will find a very enthusiastic and supportive dev group and player base that offer up loads of support to get you through the rough patch.

This game has the makings of a great single player horror FPS, and a great multiplayer competitive shooter. Add in the ability to do multiplayer co-op, and it becomes an epic game. It has a fine balance between frantic shooter and tactical shooter. As I see the story plans unfold, I suspect I will be enveloped by an epic single player story when it is finished.

As long as this game stays on the current heading, it will become a classic that everyone will remember. I have so much fun with this game that I bought it for all my closest gaming buddies.

If you buy it based on this review, I only hope that you enjoy it as much as I do, or meet me on the server and let me help you work those new shoes in until they are comfortable.
Was this review helpful? Yes No
29 of 34 people (85%) found this review helpful
87.3 hrs on record
Posted: November 28
Early Access Review
Whilst it is Early Access, this team, Zeropoint Software (ZPS) has such passion and dedication that there is no worry with this game. As it is, it's a very nice singleplayer / 4 player co-op / mp team deathmatch/capture space FPS that is highly tactical and fun to play. Updated frequently and has a great community as well as good community support from ZPS.

Definitely worth supporting, I bought copies for all my friends.
Was this review helpful? Yes No
17 of 19 people (89%) found this review helpful
44.6 hrs on record
Posted: December 3
Early Access Review
The basic problem with most of the negative reviews is almost all include very little playtime.
This game gets better and better the more you play. It is not like Counter Strike but both games share this.
The charging bots will sometimes scare the crap out of you. Sometimes they seem to come from nowhere.
The sounds of them moving are also VERY eerie. It reminds me of hearing the face huggers slither around in one of the earlier Alien games. Occasionally you will hear someone whispering, “Help me”. Eek.
Overall, the atmosphere of this game is wonderful.
The game includes many types of gameplay even though it is early assess. Personally, I like the ones that are coop against AI.
The game is tactical. If you wander off on your own, you will likely soon die.
Being early access, the game is clearly not finished. The basic game does play well and is a blast in its current state. That said, there are issues. The game is not optimized well yet so lag can sometimes be an issue. There are not many on the servers but I have found if I join an empty one, others join. You can also play single-player but this game is not easy on your own.
The Dev’s have a lot to get done before they can call this complete and they are a small group. I like buying this type of game in early access as it is a lot of fun when patches are released. For being early access, the game is a blast and I would highly recommend it if you like tactical shooters, especially coop ones.
Was this review helpful? Yes No
25 of 34 people (74%) found this review helpful
0.7 hrs on record
Posted: December 5
Early Access Review
I can see my feet. 10/10
Was this review helpful? Yes No
10 of 14 people (71%) found this review helpful
10.9 hrs on record
Posted: November 26
Early Access Review
The atmospherics are outstanding.

I was an early adopter, being entirely sold by the pitch. Initially I was a little dissapointed as there really wasn't much going on at all... though every few months I check back to see how the development process is getting along. I'm very glad to say that each time I've looked, I see improvemnets. I've absolute patience for this project and applaud the dev team for their vision.

The latest update adds enough content to get a good feel for the combat, is fiendishly challenging, very playable and highly immersive. Excited to see the final version with story, I get the feeling it's going to be great.
Was this review helpful? Yes No
12 of 18 people (67%) found this review helpful
0.7 hrs on record
Posted: November 22
Early Access Review
Damn near ♥♥♥♥ myself when i turned a corner and this robot was staring me in the face, angry as could be.

worth my money already!
Was this review helpful? Yes No
9 of 13 people (69%) found this review helpful
3.2 hrs on record
Posted: November 30
Early Access Review
By the time this game is out of beta, lightbulb makers are going to be rich!
9 shattered lightbulbs/10
Was this review helpful? Yes No
9 of 13 people (69%) found this review helpful
3.7 hrs on record
Posted: December 13
Early Access Review
I don't think I've ever been quite so worried by the sound of clanking metal.
Some games are dark, but you can just make out the world. This game is pitch black in most of its single player modes, so without your torch, you can't see anything. And that torch attracts attention (well it really doesn't seem to make a lot of difference but it's nice to pretend).

Slowly improving since it began a few years back, this game has turned out pretty solid, but still has a long way to go. I'm going to stick around to see were exactly that is.

10/10 would get pimp slapped by a robot again.
Was this review helpful? Yes No
6 of 8 people (75%) found this review helpful
99.4 hrs on record
Posted: December 4
Early Access Review
With half life and rainbow six as inspiration, this game has enough thrilling game play, even now as an early access game. The things that surprised me positively is the pace and the environment. The graphics is nothing much, but the sound system and the ambiance makes it very easy to forget anything IRL and focus on the menacing robots down the corridors.
Was this review helpful? Yes No
7 of 10 people (70%) found this review helpful
12.2 hrs on record
Posted: December 2
Early Access Review
Whoa, tried coop survival, was awesome!

Move together, cover each other, manage ammo, crouch if buddy is behind you.
Was this review helpful? Yes No
8 of 12 people (67%) found this review helpful
1.9 hrs on record
Posted: November 30
Early Access Review
-Starts game
-no explanation or whatever, game starts
-wandering around aimlessly
-saw a big door and starts looking for a switch
-turned around and BAMM! a ♥♥♥♥ing robot was sprinting at me
-sprayed bullets like a blind man in an earthquake but killed it and nearly had a heart attack
-turns back to look for switch
-another robot was already beside me
-skipped a heart beat
-died from 2 punches

Overrall: The best early access HORROR THRILLER FPS game i've ever played
10\10 would get heart attacked again
Was this review helpful? Yes No
10 of 16 people (63%) found this review helpful
13.6 hrs on record
Posted: December 13
Early Access Review
Best alternative to laxatives on the market...
Was this review helpful? Yes No
3 of 3 people (100%) found this review helpful
4.1 hrs on record
Posted: December 18
Early Access Review
There is no game out there like this ,the game has the most potential from all these early acces games,the developers are working for more than 10 years on this ,the game is growing slow because there is not much interest in it from the people .The game promotes the most interesting gameplay I have ever seen, as you play you get a certain feel and style of play but that feel chages completly and very rapidly when the map switches itself ,something like the levolution in Battlefield 4 but here is done much better ,and the developers arent saying it for the sake of saying somethig about the game like most do they really got it,they did a good job at what they intended to do for now ,sure there are many things needed to be added/repaired and they will do it, but they need our help . :D sorry for my sp00ky english m8s
Was this review helpful? Yes No
5 of 7 people (71%) found this review helpful
84.0 hrs on record
Posted: November 21
Early Access Review
I bought this game as an investment, hoping to both reap a reward from a sophisticated, finished piece of work when completed, as well as to support the dreamers behind it. Now, I play the game because I share the dream. Not only is the game becoming a fully-fledged FPS experience ( very active developers with updates being released almost monthly), but the developers are finally making significant progress toward achieving their goal: realistic sci-fi FPS, in a truly tactical environment. A year ago, this could have been a rough demo. Now, it has grown into a ridiculously satisfying ball of tactical joy that I relish every time I capture a point. So, for the love of the game , buy Interstellar Marines now!
Was this review helpful? Yes No
5 of 7 people (71%) found this review helpful
14.5 hrs on record
Posted: November 24
Early Access Review
This is a fantastic game as I have followed the update progress and played this, it just keeps getting better.
Was this review helpful? Yes No
7 of 11 people (64%) found this review helpful
2.8 hrs on record
Posted: November 26
Early Access Review
This game made robots scary.
Was this review helpful? Yes No
3 of 4 people (75%) found this review helpful
12.1 hrs on record
Posted: December 16
Early Access Review
For the love of the game, indeed.
The Dev's at Zero-Point have done a great job with updates on this game and you can tell they really are making a game where they not only consider their own input, but their community's as well.

When I first picked up the game, I enjoyed playing against others with nothing but just the basic SMG at a time when crouching (or jumping, I forget) wasn't even in the game, not to mention AI or actual co-op other than the Deadlock game mode.

I stopped playing for a couple months and came back to find a second rifle, a fully functioning AI system that utilizes one of the two firearms and another type for melee, not to mention six co-op missions, eight maps each with its own dynamic weather and it's safe to say I was pretty blown away.

The AI is fun to play with, especially on co-op, and with their ability to register light and sound they fully react to your every move and it doesn't help that they can be clever little robo-♥♥♥♥♥es sneaking up behind you and sprinting at you with a robotic screech which will startle you when you least expect it. The addition of suppressors for both firearms is great because this not only affects online play with players, but also the robots.

So yeah, you can be a ♥♥♥♥ and send all the robots a'runnin' to you and your squad. Community is friendly, helpful, and lively enough. Go on any day of the week at pretty much any time and sure enough there will be at least a couple of servers with players in them.
Was this review helpful? Yes No
4 of 6 people (67%) found this review helpful
33.8 hrs on record
Posted: November 30
Early Access Review
this would probably be one of the best games i've played so far, the graphics make you go "WOW" every so often. While the land sharks are not ingame, as i'm posting this, it's still a great pvp/pve game. Team co-operation is needed for the PVE maps, you cannot win if everyone goes in their own direction. All this being said, Zero Point has done a great job with this game, i cannot wait for more features to be added.
-Holz
Was this review helpful? Yes No
5 of 8 people (63%) found this review helpful
3.4 hrs on record
Posted: December 3
Early Access Review
Exellent game, especially for early access. It's the best parts of Battlefield 4 and Planetside 2 combined plus some extra features. Worth your money now, and once it's finished, it will be even better.

(Thanks to That thing in your cup for introducing me to the game)
Was this review helpful? Yes No