UPDATE 28 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-scripted AI. Play Singleplayer or Co-op/PvP on servers around the world.
Recent Reviews:
Mostly Negative (13) - 23% of the 13 user reviews in the last 30 days are positive.
All Reviews:
Mixed (3,855) - 61% of the 3,855 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

Interstellar Marines - Spearhead Edition Upgrade


Recent updates View all (47)

May 21

Update 28 - Engine Upgrade

Update 28 - Engine Upgrade

Hello Marines, we’re very excited to announce Update 28!

First, we want to thank everyone who participated in ITO Testing - you’re the best!

Update 28 has finally been wrapped up and released. In this update we’ve upgraded Interstellar Marines from Unity 5.1.3 (released August 2015) to 5.6.7 (released March 2019). This much needed upgrade allows us to utilize awesome new features and improvements, which includes increased performance/optimization, lighting improvements, shader upgrades, GPU instancing, PBR materials, API changes, deferred rendering, DirectX 11 support for Windows, and more.

These improvements will allow for Interstellar Marines to continue to be more immersive, enhance visuals, and set us up to begin adding new features and content.

Below is our brand new Update video which showcases the potential of the Unity upgrade and other cool features/content we’ve added to U28.

Update 29: Planning Phase

We haven't discussed and decided what we're going to do for U29 yet, so we'll post another announcement in the coming weeks with what we have planned.

Your Team at Zero Point Software

Join our official social media and community groups to stay connected and chat:

Interstellar Marines - Update 28
(0.5.28 - Revision 1497)
Platforms available, 32-bit & 64-bit
Windows, Linux, OSX

Changelog for Update 28

What’s New

ADDED: Basic lean mechanics
ADDED: Weapon block while leaning and recognizes corners too
ADDED: Lean audio files (by Eduard)
ADDED: Linux editor support
ADDED: Unity's new Post Processsing v1 stack to all cameras
ADDED: Post processing linked to settings
ADDED: Settings connection to new proper motion blur post process
ADDED: Reflection probe intensity is linked to weather state
ADDED: Reflection probes are eased in on forced weather system
ADDED: Screen Space Reflections to settings menu
ADDED: Exhaustion and Damage post process mechanics (Chromatic Aberration and Tonemapping)
ADDED: Jump penalty added to exhaustion
ADDED: Player state post processing influence
ADDED: Performance optimizations
ADDED: New Map "Upper management" in playground (Released when finished)
ADDED: ECSChat server host defined in command line arguments
ADDED: [REDACTED] to Resort (first iteration)


UPDATED: Unity 5.1.3 (released August 2015) to 5.6.7 (released March 2019)
UPDATED: Legacy defered renderer -> Defered renderer
UPDATED: Directx 9 -> Directx 11 on Windows
UPDATED: Metal on MacOS
UPDATED: Helmet rain particle effect toned down
UPDATED: Disabled "frame blending" from motion blur amount controls
UPDATED: PPP a bit more AO and tweaked SSR for best results to performance ratio
UPDATED: GUIDamageWarning made WARN flash 10x faster for better HUD immersion
UPDATED: Material on a couple of trees and updated the Trees.unity scene
UPDATED: Marine Audio with lean sfx
UPDATED: Lean Audio Implementation to never use the same audioclip twice in a row
UPDATED: Settings on all audio clips to use "Compress on Load" and now only 2 large mp3 are still using "compress in memory"
UPDATED: Operations Wargames so lights occlude correctly and reflection probes with adjusted values
UPDATED: Weapon materials to allow occlusion map to work correctly
UPDATED: Player/PlayerCamera settiings for more accurate heatbeat pulse and pace also tweaked chromatic curves and amount
UPDATED: Default Black to not have spec when used as background in Intro Cinematic
UPDATED: Intro Cinematic scene so IM logo is more lit and MEG spotlight shadows are adjusted correctly
UPDATED: Lean to play audio every time
UPDATED: Lean to prioritize Sprinting
UPDATED: Lean controls to be toggleable
UPDATED: Weapon and Marines materials with small tweaks
UPDATED: MEG materials for less highlight
UPDATED: LightHandler to set EmissiveBoot to 2 default
UPDATED: Megalodon scene fixed lights
UPDATED: Sandbox added vending machine as emissive reference
UPDATED: Star Crown/NGI with foliage fixes and adjusted location of door buttons
UPDATED: Reflection proble clear color set to black. (Nucleus)
UPDATED: Post orocess colorgrade contrast from 0.65 to 0.85 for more accurate colors
UPDATED: General emissive materials
UPDATED: Hell Guardians to be a bit faster and easier to kill
UPDATED: Hell geysers to glow with orange lava
UPDATED: Eye adaptation is disabled on MacOS since it doesn't work with Metal in 5.6.7


FIXED: Players may sometimes fall through the floor of a map (Unity 5 bug) FINALLY!!
FIXED: Trees in starcrown are now fixed with correct shaders
FIXED: Spotlight shadows in Main Menu MEG scene
FIXED: Normal texture fixes for tree branches
FIXED: Bush1-3 materials to render properly
FIXED: Megalodon scene fixed lights
FIXED: Glowing leaves normal map texture
FIXED: Abbility to shoot through things while leaning
FIXED: AA dropdown collapsed
FIXED: Missing navigation data on Jungle.unity
FIXED: Tree shaders in Welcome to IM map
FIXED: Static elevator Ground plates in Lunar
FIXED: MSAA removed from spectator camera
FIXED: CP counter bug when player has more than 15 mill. points
FIXED: Bush in Subarctic has wrong shader
FIXED: Occlusion from tower in stronghold is blocking environment when tower is elevated down
FIXED: PerformanceTracker regression disabled
FIXED: Lean twitchy transition (TEMPORARY FIX)

Known Issues
  • 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)
  • The gamepad implementation is early and experimental, so may cause issues (Disable Gamepad in menu if mouse/keyboard controls does work as intended)
  • 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

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.
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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-scripted 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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