UPDATE 27 AVAILABLE - Interstellar Marines is an immersive tactical sci-fi First Person Simulator in the making, offering a unique blend of tactical gameplay, dynamic environments and non-scriptet AI. Play Singleplayer or Co-op/PvP on servers around the world.
Recent Reviews:
Mixed (30) - 63% of the 30 user reviews in the last 30 days are positive.
All Reviews:
Mixed (3,661) - 64% of the 3,661 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?

“Early Access have allowed us to develop the core features and technology platform of the game of our dreams in the making, which would not have been possible otherwise. We're at a point now where we can finally start to attract the attention of publishers/investors and complete the game; kickstarting this ambitious franchise. You can follow our progress & recommend publishers for us to work with on our Publishers & Investors Info/Status sheet.”

Approximately how long will this game be in Early Access?

“In June 2016 we started looking for a publisher/investor to fund the completion of Interstellar Marines: Aspiration and help us release out of Early Access on Steam and port it onto PS4 and Xbox One consoles. Once we have finalized an investment/publishing agreement, we estimate 17 months from that date until Interstellar Marines: Aspiration is completed. We extremely honored to spend this time with you, the player, and share the experience all the way from pre-alpha to the release.”

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 make the game of our dreams. 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. These are the features you can experience right now:

  • Wargames (Sandbox Combat Arena)
  • 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)”

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.”
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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.

Buy Interstellar Marines - Upgrade to Spearhead Edition

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Recent updates View all (45)

January 20

Update 27 - To Hell and Back

Update 27 - To Hell and Back

Good news everyone!

Thanks to our wonderful crew of community volunteer developers, Update 27 has been wrapped and released! Going into the volunteer program we weren’t sure what to expect, but we knew development was much too slow and something had to be done, and we sure are glad we took a chance and accepted some help.

Now that we have a better idea what the volunteers are capable of and how to manage volunteers rather than regular employees, we plan on more frequent updates in the future.

We’ll need to upgrade the Unity engine sooner rather than later. Our current engine version is the 2 year old 5.1.3 released August 2015, and by upgrading we’ll be able to utilize all the new and improved features, graphical and performance benefits of an up-to-date version of Unity.

We’re also very focused on getting more weapons and tactical features into the game and we also really want to expand the AI of our enemy Combat Training Robots, to make them much more intelligent and challenging; with the AI teaming up playing SP/COOP/Wargames with strategy and tactics.

We’ll update Trello the second we know what we’ll focus on for Update 28.

Your small team and awesome volunteer army at Zero Point Software

Interstellar Marines - Update 27
(0.5.27 - Revision 1354)
Platforms available, 32-bit & 64-bit
Windows, Linux, OSX

Changelog for Update 27

What's New

ADDED 64 Bit support for all platforms.
ADDED Tactical Reload.
ADDED 2 light modes (dark/light) to GKBB controlled by a power box & other changes.
ADDED New AR03 Firing sound.
ADDED New OS-1 Pistol Firing sound.
ADDED Support for arrow keys bindings and quality of life changes to the skin menu!
ADDED 10 random Bullet Whiz sounds from Running Man into Marine 1P impact sound list, until we get a proper bullet whiz system implemented
ADDED CheckIfMinAndMaxValuesMatch to IntelligenceBase to eliminate unnecessary calculations
ADDED New Suppressor_2_A model iteration 1, added materials and created Suppressor_2_A.prefab
ADDED Support for CTR's spotting targets with their flashlights.


UPDATED CTR defective, SMG and AR with changes made by Tanner, they're much more reactive and precise now
UPDATED HP for defective (melee) decreased so all CTR's will die if hit in the head, and done some general normalization of the HP on the body parts
UPDATED Movements speed of CTR SMG and AR, so SMG is faster in patrol (walk) and assault (run) and the AR is a bit slower in patrol and assault
UPDATED Get Killed By Bots map with more accurate Navigation mesh and CTR teams 1 and 2 is now White vs Black (no political agenda intended), it was just the two CTR skins most different to each other ;)
UPDATED InputManager.cs to fix the controller firing bug
UPDATED AR Aiming noise time increased from 0.75 to 0.8, equal with SMG
UPDATED SMG Recoil Aim scale reduced from 0.9 to 0.75, equal with AR
UPDATED SMG Breath/noise bob aim ratio lowered from 1 to 0.5, equal with AR
UPDATED Welcome Mission scene with adjusted suppressor pickup prefab and change so you only get one (to share between weapons)
UPDATED Sandbox scene with Arsenal locker + 3 suppressor pickup prefabs.
UPDATED All weapon prefabs to accept new Suppressor prefab
UPDATED Suppressor Pickup to present the Suppressor_2_A model
UPDATED CTR AR/SMG Accuracy values changed
UPDATED Fixed values related to spinning CTR, fixed reaction time
UPDATED Increased pistol ADS recoil scale
UPDATED Reduced AR reload speed to be more consistent with SMG
UPDATED AR and SMG prefab lurch values
UPDATED Made CTR's identification of targets less random and more consistent.
UPDATED CTR SMG/AR accuracy values making them more accurate.
UPDATED increased SMG ammo capacity to 32 and SMG ammo pickups to 32.
UPDATED increased SMG burst mode to 4 rounds.
UPDATED Get Killed By Bots with two different light settings to test CTR’s new ability to “detect/see” players with their flashlight. (Cycle the light switch to re-illuminate red lights that get shot out).
UPDATED Skin menu with new quick select option (Select and stay in the menu or HOLD CTRL to exit as soon as you select a skin).
UPDATED SMG, AR and Pistol with slightly less FOV change for added realism (until we can simulate sight magnification)
UPDATED Recoil lurch V3 system.
UPDATED CTR's spotting targets with their flashlights.UPDATED SMG ammo capacity to 32, ammo pickups to 32.
UPDATED Minor tweaks in lens flare distance. (visible from a bit further away and close up)
UPDATED Lighter ammo and weapon crate interiors.
UPDATED Defective and Guard CTR damage values updated to correspond to player's.
UPDATED Defective CTR body and limb damage values halved, head shot now 1 hit kill.
UPDATED Weapon recoil values adjusted.
UPDATED Smaller camo patterns for purchasable ZPS created camo skins.
UPDATED Increased the length of the mouse setting scroll reticle so all options fit in all resolutions.
UPDATED NGI CTR medical cross to green, resolving a Geneva Convention compliance issue.
UPDATED Reload mechanics with CTR animation controller.
UPDATED Ammo counter sights optimization.
UPDATED Supply crate Pre-fab updated for more exact placement and new aligned pickup locations.
UPDATED Suit Systems to properly work with reload sound.


OPTIMIZED recoil view rotation calculations by disabling them unless weapon is being fired.(except in semi-auto mode it always calculates when fire button is hold down)
OPTIMIZED exhaustion view rotation calculations by disabling them when not needed


FIXED canceling suppressor attach, when quickly hitting the key multiple times.
FIXED Ammo counter visible through everything.
FIXED Client not knowing it had suppressors.
FIXED Multiplayer suppressor bug when equipping and unequipping super-fast.
FIXED Revive attachment poof bug.
FIXED Semi-auto aim slow rise.
FIXED Random no recoil bug on burst mode.
FIXED Weapon swap with alpha keys.
FIXED Weapon swap using d-pad on gamepad.
FIXED UI not showing at certain resolution.

We will continue utilizing the ITO tester program to test progress on upcoming updates.

To become an ITO tester join our official Discord server and post “!Enlist ITO Tester” in the role-requests channel. Then you'll receive access to the ITO testing announcements where you’ll find the code to unlock the beta branch in Steam.
101 comments Read more

January 8

FIVESTAR Championship Series

Are you a competitive Interstellar Marines player who’s found themselves hungering to return to the battlefields we all know and love? Or perhaps you’re a new player, ready to prove themselves among the elites?

Whatever your motives are, long-time community member Five5staR is giving everyone the chance to compete in his standalone competitive league, the FIVESTAR Championship Series!

Join the action at their discord;
Signups are free and going on right now for the 2018 New Year Blind Pick Tournament (16+ players required). Message an admin at the FCS Discord for more information.
31 comments Read more
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About This Game

Interstellar Marines is an immersive tactical sci-fi First Person Simulator in the making, offering a unique blend of tactical gameplay, dynamic environments and non-scriptet AI. Play Singleplayer or Co-op/PvP on servers around the world.

Interstellar Marines is inspired by movies such as Aliens, Starship Troopers and Saving Private Ryan; and games such as Half-Life, Deus Ex, System Shock 2, and Rainbow Six 3: Raven Shield.

Interstellar Marines is all about evolving the FPS recipe with 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.

Interstellar Warfare Initiative

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 special forces soldier training to join the Interstellar Marines, a part of the secret Interstellar Warfare Initiative being established to protect humanity against potential threats from the confines of the unknown universe.

It's time to evaluate the Interstellar Warfare Initiative and program evaluations are taking place at The Vault, ITO’s most advanced military facility on Earth enclosed deep beneath Groom Lake, Nevada. Supervised by SARA, ITO’s central neural network AI, SARA will program artificial weather and advanced combat training robots to test each warfare initiative to the limits.

This is where the game begins ...

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!

Wargames (Sandbox Combat Arena)

Unique sandbox combat arena in the making. Wargames is played across 9 distinct interconnected environment zones allowing 64 players to join in the scavenge for combat points, playing alone or in co-op. We have a special Wargames Steam Leaderboard which tracks Combat Points globally, monthly, and survivors of Wargames.

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
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