UPDATE 25 AVAILABLE - 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 servers around the world.
User reviews:
Mixed (6,541 reviews) - 67% of the 6,541 user reviews for this game are positive.
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 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:

Why Early Access?

“We have this crazy idea that an independent game developer can develop something the size and quality of a AAA game, by having the community take the role of publisher. We call this concept AAA-Indie. This gives players the game they want, instead of the game a greedy publisher wants them to have. We know Interstellar Marines is going to take a long time to make, after all we’re making a AAA game without the size or resources of a AAA studio. So rather than toiling away behind closed doors we want to spend this time with you, the player, and share the experience all the way from pre-alpha to the release version.”

Approximately how long will this game be in Early Access?

“This is for the love of the game, not the money. We'll be in Early Access until we have delivered our ambitious vision or Valve decides to shut down Early Access. So... a long friggin time.”

How is the full version planned to differ from the Early Access version?

“Spearhead and Frontliner Editions will only be available in Early Access for those brave enough to support our quest to create a AAA-Indie game! For the full version we plan on having a Regular and Deluxe Edition. As far as features our plans for the full version include:

  • 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 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.

The full version will be more SP/Co-op focused than the current Early Access version where we are implementing and testing new mechanics primarily in a PvP multiplayer environment.”

What is the current state of the Early Access version?

“The game is in pre-alpha and players can expect to experience bugs, missing features, incomplete content, and some game breaking issues. Still, we have a couple community members with over a thousand hours in-game, and many with hundreds of hours. In the portion of the game currently available you are training in a top secret facility 2km beneath Groom Lake Nevada. These are the features you can experience right now:

  • Hell Week Event
  • 2 SP/Co-op Campaign Missions*
  • 4 Difficulty Levels
  • 5 Challenge Missions
  • 9 Multiplayer Maps
  • Dynamic Environment Effects
  • 3 PvP Game Modes
  • 100% Dynamic Lighting
  • Destructible Light Fixtures
  • Full-body Character Simulation
  • Visor Affected by Fog, Dust, and Rain
  • Spectator Mode
  • Movie Mode
  • Playground Mode
  • 3 weapons**
  • Tactical Laser
  • Tactical Flashlight
  • Ragdoll Physics
  • 28 Steam Achievements
  • Dedicated Servers Worldwide
*(Currently available as stand-alone missions)
**(pistol currently uses placeholder model)

We have a small but active multiplayer community. Look HERE to see when the most people will be on for you to play with, it is usually during the evenings in North America and Europe. There is also a budding esports scene at www.phyregaming.com that we sponsor.”

Will the game be priced differently during and after Early Access?

“We intend for the price to follow the value of the game. Expect it to gradually rise as we ship new content, but we may need to lower the price on rare occasions to correct for market conditions.”

How are you planning on involving the Community in your development process?

“The community can follow our progress on the Trello Board and vote for features they want to see. They will also be able to report and track bugs once we choose a bug tracking software. Players can also interact with the developers on the forums, in bi-weekly community get-togethers on our TeamSpeak Server, and at hosted esports events as soon as game features support it.”
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Buy Interstellar Marines

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

Buy Interstellar Marines 4-Pack

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

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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Recent updates View all (38)

March 21

Update 25: Chameleon

Good Morning/Afternoon Marines!
This latest update to Interstellar Marines increases the value of your Combat Points (CP) by offering unlockable skins allowing you to blend in, or stick out, as much as you’d like.

Update 25 also adds a shining new menu interface and we've revamped the Introduction mission to include some of our new features.


We’ve added a new menu interface created with Unity 5's UI system and we’ve also managed to squeeze in the option to vote for map, gamemode and difficulty in both co-op and multiplayer.

In our brand new customization hub you’ll find a broad range of cool tactical skins, and you now earn Combat Points (CP) during missions, challenges and multiplayer to unlock them with.

Special thanks to our community members who helped with camo designs!
  • Bourbon the Insane
  • Ninja Cat
  • ZundiePW
  • Gater
  • TmsFin
  • Jackerino
  • Rien Moeyaert
  • Timothy Creitz
  • Five5staR

In its new iteration Hell Week has been renamed Wargames, a more fitting name for our co-op, singleplayer and player-versus-player sandbox combat simulator in the making.

We’ve tweaked the server settings and added a new Wargame called Scavenge, where you can collect combat points 24/7. But look out - You are up against 128 bots as well as all the other skilled and tactical players!
  • Scavenge wargame is 55 minutes long.
  • Scavenged CP’s are collected when wargame ends.
  • Unlimited respawns

We’ve updated the Introduction mission to make sure new players get a more consistent first impression of the game and the features currently available. Revamped sections are shooting range, stealth test, crashed dropship mission simulation and we added a fun little stress test and maybe an Easter Egg or 2.


What's Next

We’ve been taking a critical look at the inertia and general challenge of surviving in Early Access and decided to find and team up with an indie-friendly publisher moving forward to improve our development capabilities. Meanwhile, there will be updates, missions, and new game modes as often as we can make them while we search for the right partner to help realize our ambitious vision for Interstellar Marines.

Your team at Zero Point Software

49 comments Read more

December 18, 2015

Update 24: Merry XMayhem

This update brings some new features, some returning content, and fixes. The Annual XMayhem mode has returned once again with the special achievements unlockable only during the event. We also have a brand new map created by Auxsiren that’s a complete overhaul of Evacuation (Evac 1 will still be playable in the map pool). There are also now special camos for CTRs that you can see specifically per map, this is a big step to add in player skins. Included as well is a new party system included to help you team up with your friends, chat with them, and more. Finally there are fixes for bugs as well as the crashes from last update.

From all of us here at Zero Point Software, we’d like to thank you for supporting the game and we wish you a Merry Christmas and a Happy New Year!

Your Team at Zero Point Software

What's New

ADDED: Winter XMayhem Game Mode on Mainline Winter
ADDED: New Evacuation 2 map to multiplayer
ADDED: Ability to add variable skins to CTRs. This is a major step to in-game player skins
ADDED: Nine CTR skins. CTRs now have map-specific skins, with many of them camouflaged
ADDED: Party system to team up with friends, audio/visual invite notifications, chat room + additional features
ADDED: Inviting friends into a Hell Week game will spawn them close to you in the same zone, and in your team
ADDED: Chat system to menu view when in-game (press ESC to access)
ADDED: Kill confirmed and Zone captured messages are stacked on top of each other
ADDED: Mission successful +XP message when completing a single player/coop/multiplayer mission/match
ADDED: Revive successful message when player is revived
ADDED: Warning messages for low health, team kill warning and revive needed
ADDED: Variable delay to TP popup messages


UPDATED: The NeuroGen Incident with new spawn points for players joining mid-game. Joining during end game will place joining player as a spectator
UPDATED: Nucleus with additional check point spawns for players joining mid-game
UPDATED: Chat system with Spearhead, Best Clan, Dev icons, UI improvements, message notification improvements, button to open/close etc
UPDATED: Clicking a player name in chat will bring up the Steam overlay with their profile (need Steam overlay enabled to work)
UPDATED: In Hell Week, when players up for elimination have the same score, decision of who to eliminate is random rather than player-name based
UPDATED: XMayhem game mode to be compatible with the new additions from 2015
UPDATED: T-IM101 has 8 x health, and does 4 x damage, compared to regular Marine
UPDATED: Xmayhem gift announcer loop
UPDATED: If a revive is halted, player's bleedout timer is set to percentage of revive completed, if higher than bleedout timer
UPDATED: In Hell Week, if a player is eliminated by any means other than the elimination timer, bleedout timer is reset
UPDATED: Nucleus elevator with all onboard elevator trigger to prevent players being stuck, and grid to stop players falling off
UPDATED: Nucleus with cull groups, rather than disabling the sub level, when player reaches top level
UPDATED: Hit markers are accurate to the hit location
UPDATED: UI icons scale according to resolution instead of being a fixed size
UPDATED: UI icons counter-scale when zooming in
UPDATED: Changed neutral zone colour to be more visible, and best team colour to be light purple
UPDATED: Match Completed +XP shown at the end of a match, Match Won +XP shown for the winners
UPDATED: End of game horn + win/lose music play at end of Team Domination and Team Deathmatch games
UPDATED: Hell Week shows Survived Hell Week +XP message for surviving players at game end
UPDATED: Revive TP score is 25XP
UPDATED: Size of Team Domination corners increased for greater visibility
UPDATED: Deadlock capture zones have different capture/finishing beeps for clarity
UPDATED: Resort map with cull groups and new nav mesh
UPDATED: Multiplayer thumbnail in main menu for some Christmas cheer!
UPDATED: Browser ping and quick join systems temporarily removed
UPDATED: Supply crate icons updated and improved


FIXED: "Crashing to desktop with no error log"
FIXED: "Negative HW score when collecting CPs just as the game ends"
FIXED: "Resetting of items in a Hell Week server now occurs correctly"
FIXED: "Map settings for correct ahievement progress on Colony, Nucleus and Operations"
FIXED: "Treasure Hunter and Fort Knox achievements"
FIXED: "Late-joining players seeing already-used waypoints"
FIXED: "Team scores in TDOM/TDM showing in wrong colour/wrong position"
FIXED: "Disconnected players no longer shown as connected in Mission Overview when moving to another zone"
FIXED: "Player icons randomly flashing on screen when player is joining"
FIXED: "Kill confirmed icons show when enemies kill each other"
FIXED: "Screen flashing white when entering a match"
FIXED: "Press space to spawn is no longer displayed when a player has been eliminated in Hell Week"
FIXED: "Reviving a player pauses the bleed out time"
FIXED: "Spectator mode correctly shows players, kill markers and zones"
FIXED: "Removed HUD instantiation from dedicated servers"
FIXED: "Two Deathmatch spawns in Mainline Winter"
FIXED: "Chat correctly scrolls to bottom when Player Joined Server, and You Have An Invitation messages are added"
FIXED: "Light handler issue, which caused the light handler intensity contribution to be overridden"
FIXED: "Nav mesh in Operations - Survival A"

Known Issues

The Welcome Tutorial achievement is not working (due to an incorrect setting in the map)
The gamepad implementation is early and experimental, so may cause issues
When viewed up-close, some CTR heads may increase in size
Some vegetation appears to have black edges
The number of players in the Friends Lobby may not update until the lobby tab is clicked on
Players may sometimes fall through the floor of a map
Standing in a doorway when the door closes may result in the player being pushed vertically
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. If you are on a moving elevator or platform, this will cause you to fall through it. If you are in a Party, this will disconnect you from the Party
View jittering may occur when jumping on lossy networks
Other players will seem to float above or interpenetrate while standing on a moving dynamic platforms (network smoothing will exaggerate this effect)
Player may sometimes spawn with no ammo in one or both weapons. Reloading fixes this

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About This Game

UPDATE 25 AVAILABLE - 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 operative 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 movies such as Aliens, Starship Troopers and Final Fantasy; and games such as Half-Life, System Shock 2, and Rainbow Six 3: Raven Shield. Interstellar Marines 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.

*role-playing not yet implemented

Welcome to Project: IM

Since man first raised his head to the stars above, he has dreamed of conquering space. Interstellar Marines is the age old dream come true. It is the dawn of the 22nd century, a time of great hopes and expectations. The discovery of a new and inexhaustible well of power known as Zero Point Energy has revolutionized space travel. Man has escaped the confines of Mother Earth, and gone on to colonize the solar system.

But far away from public awareness an ambitious military project has already taken Man beyond the final frontier, and into the regions of the stars. The powerful Interplanetary Treaty Organization, ITO, is secretly constructing the first human settlement in another star system. You are a new member of the Interstellar Marines, a secret battalion within the ITO special forces created to protect humanity against potential threats from the confines of the unknown universe.

Now gear up Marine, we’ve got training to do! Welcome to Project IM.

New Hell Week Event

Featuring 9 New and unique areas where 64 players battle until only 4 are left standing! This event runs every 3 hours in each timezone, so there’s always one somewhere in the world starting at the top of every hour. We also have a Steam Leaderboard for Hell Week here which tracks Combat Points globally, monthly, and survivors of Hell Week. We'll let you know more about Hell Week Finals when it’s ready.

7 Singleplayer/Co-op Missions

Play 5 co-op and single-player missions against unscripted AI with dynamic environment effects or two pivotal missions inside the Interstellar Marines universe, The NeuroGen Incident and Assault on Starcrown Aerospace. Play singleplayer or co-op with up to three friends in intense action with more co-op and singleplayer missions to come!

9 Unique Multiplayer Maps Across 3 Game Modes

Take your friends out in Deadlock, Deathmatch, and Team Deathmatch on maps featuring dynamic environment effects such as time of day, rain, thunder and lightning, emergency lighting, fire alarms, moving platforms etc.

Realistic Simulation

With a physics-based dynamic character controller there are no floating hands, and you can even see your feet! The physically present combat helmet has a HUD projected onto the visor and is affected by dust, rain, fogging, and damage. Aim down the sight for the long shots and use the tactical laser to assist aim when hip firing, as there are no artificial crosshairs to break immersion. Use the intuitive crouch and cover system; spacebar (default) peeks over cover, and looking down leans you forward to see over ledges. You can also shoot out the lights and prowl in darkness, or use the tactical flashlight if you’re afraid of the dark.

We hope you enjoy the game, and look forward to developing it with you as we progress through Early Access!

Your team at Zero Point Software

System Requirements

Mac OS X
SteamOS + Linux
    • 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:3 GB HD space
    • Sound:DirectX 9.0c Compatible
    *1 map, Neurogen Incident, temporarily requires 64-bit OS and 4 GB RAM until it is optimized
    • 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:3 GB HD space
    • Sound:DirectX 9.0c Compatible
    • Other Requirements:Broadband Internet connection
    *1 map, Neurogen Incident, temporarily requires 64-bit OS and 4 GB RAM until it is optimized
    • 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:3 GB HD space
    *1 map, Neurogen Incident, temporarily requires 64-bit OS and 4 GB RAM until it is optimized
    • 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:3 GB HD space
    • Other Requirements:Broadband Internet connection
    *1 map, Neurogen Incident, temporarily requires 64-bit OS and 4 GB RAM until it is optimized
    • OS:Linux
    • Processor:2.4 GHz Dual Core
    • Memory:2 GB GB RAM
    • Graphics:Nvidia Geforce 8800 GT / ATI Radeon HD 4770
    • Hard Drive:3 GB HD space
    *1 map, Neurogen Incident, temporarily requires 64-bit OS and 4 GB RAM until it is optimized
    • 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:3 GB HD space
    • Other Requirements:Broadband Internet connection
    *1 map, Neurogen Incident, temporarily requires 64-bit OS and 4 GB RAM until it is optimized
Helpful customer reviews
94 of 105 people (90%) found this review helpful
1 person found this review funny
35.4 hrs on record
Posted: April 3
Early Access Review
The problem with this game is not that the developers are inexperienced and bad at what they do, it's the fact that they are low on money, and the community has been very negative about them being slow. They try their hardest to communicate with their community; they have a great game already made, here. They're trying their absolute hardest, but they just don't have the money to do it. I do recommend this game, highly. It has a fun and unique co-op experience, fun PvP, skins (no Microtransactions), singleplayer missions, multiple types of missions. They aren't giving up, but without these funds, they're progressing slowly.

This video tells you everything you need to know, really.


I do highly recommend this if you're on the bench about it, because it seriously is fun to play. Especially with friends. And if you're dissapointed, you can always just get a refund.
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85 of 135 people (63%) found this review helpful
6 people found this review funny
1.3 hrs on record
Posted: March 31
Early Access Review
There should be a limit to how long a game can sit in early access.

Edit: I mostly wrote this review as a quick review to just express my opinion. This now being the top review, I feel that I should elaborate.

I bought into this game very early. I'm not sure why it shows my game time as little as it does, as I played this game for proabably around ~30 hours or so. I have periodically tried this game, hoping for some significant changes to it, but it really feels like the same game it was 3-4 years ago. Sure there have been some cosmetic changes, and it is a very beautiful gtame now, but it took them over a year to even add another gun to it, making for gameplay that got stale very quickly.

At this point you can still enjoy this game with a friend. The co-op definitely has some fun left in it, but there are better co-op experiences elsewhere. If this game is finally completed and has a significant single-player or co-op campaign that is worth buying, then I will update my review. Until such time I just really can't recommend a game that has felt stagnant and doesn't seem to offer much hope of improvement.

One of my major issue is that I bought into this game because it claimed it was going to be a role-playing fps, it even still claims they plan to impliment this feature. I was hoping for this game to offer a new and unique fps experience, and really believed in the devs vision. But when 3 years later and these elements are nowhere to be found, the game ends up just feeling like another bland fps, and there are plenty other, finished, fps's that are worth playing over this one. There just isn't currently anything that this game offers that you can't find elsewhere save for the cool helmet mechanic (which adds nothing to gameplay).

I'm not claiming the devs stole my money, or even saying it's a bad design or crap game. I simply would not recommend this game that feels stagnant, has never implemented rpg elements, and does not have enough people playing, making it difficult to find full server nearby.
Was this review helpful? Yes No Funny
14 of 18 people (78%) found this review helpful
1 person found this review funny
16.3 hrs on record
Posted: April 24
Early Access Review
Last time I put it bluntly, but because there are morons on this review page that thumbs down negative reviews (I'm sure now we're at 3 years in Steam EA, they feel really smart), I'll go ahead and give my review a little more content. With more sodium.

When I first picked up Interstellar Marines, I was hooked instantly. I thought that there was no limit, and the devs fueled that feeling with vlogs showing things to be genuinely stoked for. The idea felt fresh in a genre where literally every avenue has been explored -- be it by big game industries or indie developers -- and that nothing came as a surprise. I waited for that polish to the game, and even ended up buying 5 other copies for friends to play with me and help the game grow.

"So why did you stop, why are you giving this game a bad review?"

Because these devs are slower than the skeleton crew updating DayZ Standalone.

Three years in Steam EA -- with plenty more behind that -- and what do they have to show for it? A few 'missions' and tweaks that should be done after you put in content needed to call this a game. I've seen game demos more complete than this.

I'm not sure if it's program regulations or your character just enjoys it, but you walk around like you have a giant metal rod up your ♥♥♥. It's clearly not beyond the dev team's capabilities to make a working movement animation or make the characters look convincing, just look at the robots running around.

Speaking of robots, aside from the ♥♥♥♥♥♥♥t multiplayer system they have in the game (try getting into a Hell Week lobby), did you know that they are the ONLY enemies you have in the entire game? After the initial fear of the unknown wears off, be prepared to delve into the dark with these bots either shooting at you or flailing their arms out you with some scream along the lines of "HOOOOUURRRRGH".

Three years of development, and they haven't been able to ship out a single mission past 'training simulations' for the real threats in space. I know a handful of people that -- given three years only -- would be AGES ahead of what this team has brought us in updates that provide no real useful content at all. We got a PVP/E game mode now. Whooptee ♥♥♥♥ing doo.

Maybe that was their message behind this game. That there was no alien threat and therefore we all look dumb, waiting to encounter alien lifeforms, weapons in hand. That's what I'm going to hope, because other than an overprice, sick, twisted prank, this game only stands as a pillar in reasons I don't EVER want to put money towards another game with an EA tag on it again.

Thanks devs for betraying our trust, breaking promises and dreams, and adding into the phobia of investing into an EA that becomes a waste of cash.
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19 of 28 people (68%) found this review helpful
1.7 hrs on record
Posted: April 11
Early Access Review
Yes, there are little players. Yes, it IS very raw. Yes it is in Early Acces for a long time.
This shooter has a very strong base. It has an awesome sci-fi setting, interesting gameplay. I don't know why other people write negative reviews just because of some low budget problems! The only thing that makes me go "argh!" is the requirements. It said GTX 120 and around 4GB RAM as recomended but it has only 21 fps (which are rather stable) on GTX 330M (maybe because of M?) and 8GB RAM.
Overall Conclusion: Good game! Keep it up, devs!
P.S: Liked it from the first look.
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19 of 29 people (66%) found this review helpful
1 person found this review funny
49.6 hrs on record
Posted: April 5
Early Access Review
Interstellar Marines is an immersive and addicting FPS that sets the bar high. The game prides itself with jaw dropping environments, dynamic lighting, and realism that will challenge your approach to combat. Interstellar Marines is currently sporting two missions in single player mode, co-op, and a plethora of multiplayer modes that'll keep you busy for a long while. It also handles extremely well on my aging hardware of 7+ years with impressive load times. The developers at Zero Point Software actively support the game with large updates and new quality content; even adding skins more recently. The player base is lacking but that's understandable for an early access. The game offers a healthy amount of achievements. Interstellar Marines plays like a finished product and, for $9.99, is definitely a must have.

+Dynamic Environments
+Offline bots
+Cross-Platform Multiplayer
+Active developers

-Player base
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