NEW HELL WEEK UPDATE - 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: Mostly Positive (5,895 reviews) - 70% of the 5,895 user reviews for this game are positive.
Release Date: Jul 2, 2013

Sign in to add this item to your wishlist, follow it, or mark it 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:

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 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.”
Read more

Buy Interstellar Marines

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

Buy Interstellar Marines - Spearhead Edition

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

Buy Interstellar Marines 4-Pack

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

Buy Interstellar Marines - Upgrade to Spearhead Edition

Interstellar Marines - Spearhead Edition Upgrade


Recommended By Curators

"Nice Early Access First person tactical shooter game with more to come. Solid game; Campaign, Co-op, Multi-player with lots of fun and things to do."
Read the full review here.

Recent updates View all (34)

October 1

Update 22 - Face Hell Together

Good Morning/Afternoon Marines! Today we have a big update to share with you! An updated UI, as well as a Quick Join update for COOP or Multiplayer having you join servers instantly.

Weapon Performance

The biggest change in this update, it completely redefines combat in IM. The damage has been increased, making single and burst fire more of a viable option, but recoil has increased as well bringing player skill more into play when firing in automatic.

Here is a more detailed look at the weapons by community member and YouTube personality PepperBelly.

Teaming Up

Hell Week now enables you to team up with other players to create a more team-based experience. Here is the new Mission Overview used in Hell Week! You can not only see your location, but also track your teammates across different zones to meet up and dominate.

We’ve also added the deadly CTRs which greatly increases the number of threats on the map at any one time.

Supplies Inbound

ITO AI SARA will now announce the new aerial supply drops incoming and creates natural points of friction and focal points of combat for players and teams in hell week.

Join Us

These Hell Week changes with supply drops, CTRs, and teaming up imbue a coop feeling into Hell Week rather than just being the lone wolf free-for-all from previous versions. Come join us today on our TeamSpeak server @8PM CEST and @8PM EDT to chat with the developers and experience the awesomeness of U22 Hell Week for the first time! We’ve also got a lot of cool new features like CTR Corpse-stay, and CTR flashlight use so check out the change log below to see everything that’s new!

What's New

ADDED: Ability to team up with friends in Hell Week. Press M by default to access
ADDED: Ability to invite Steam friends into a Hell Week. Press F1 by default to access
ADDED: Combat Training Robots to Subarctic, Canyon, Industrial, Jungle, Mountain, Resort, Wetlands and Lunar Hell Week maps
ADDED: Supply drops to Hell Week, each drop contains 1,250 combat points and is visible across the map
ADDED: List of all players in the current Hell Week to mission overview
ADDED: Elimination warning message to HUD in Hell Week when you are the next player up for elimination
ADDED: Quick Join system for coop and multiplayer games to enable players to join a game faster
ADDED: Message on joining multiplayer and coop games, and button to quickly open friends tab (press F1 by default to open), to make it easier to invite a friend to join you on a server
ADDED: Compass to top of HUD
ADDED: Accurate pings to browser
ADDED: News pane to the left of the main menu, displays dynamic content and notifications of events and other info. Not visible for resolutions under 1024 wide
ADDED: Pane to the right side of the main menu, displays your next 4 Steam achievements. Not visible for resolutions under 1280 wide
ADDED: Quick tips and hints when Quick Joining a server
ADDED: CTRs now use flashlights in certain situations when hunting players
ADDED: CTRs now remain in their dead ragdoll position, minus physics effects, after death. Yes, you can build mountains of CTR corpses
ADDED: CTRs that are engaging, pursuing or repelling only reload if the magazine is empty
ADDED: Ability for CTRs to carry an inventory
ADDED: Performance tracker to manage the number of CTR corpses and flashlights left after CTR death
ADDED: In-game ping to debug menu for coop and multiplayer games. Press U by default to access
ADDED: Numeric representation on mouse sliders in main menu


UPDATED: Significantly re-worked weapons shooting, recoil, damage and aiming mechanics
UPDATED: Converted in-game HUD to Unity 5
UPDATED: Mission overview in Hell Week with many new features. Press M by default to access
UPDATED: Several prefabs with correct shadow and static settings
UPDATED: CTR soil footsteps
UPDATED: Steam friends now updates every 2 seconds
UPDATED: Spectating is disabled for Hell Week and Deathmatch game modes
UPDATED: Mission overview visible when HUD is down
UPDATED: Stronghold with new nav mesh and CTR patrol paths


FIXED: "Hell Week wins and CPs not recording in Leaderboards"
FIXED: "Cause of frequent crash when exiting the game"
FIXED: "NGI elevators killing players"
FIXED: "Parasol collision on Resort map"
FIXED: "Steam friends list not updating after client has been started"
FIXED: "Server sorting now works"
FIXED: "Server memory leak, may also increase performance and stability"

23 comments Read more

September 4

Update 21: Falling Damage

Good Morning/Afternoon Marines! Thanks to everyone who helped test the ITO/Spearhead pre-release builds, and we're happy to announce update 21 is now live! We’ve now added a grace period to Hell Week to make it a bit more forgiving for players and added pausing for Single Player. There is also falling damage now, so you can no longer exfiltrate Starcrown via roof ;) or jump off the 3rd deck in operations. We still need to tweak and balance it so please give us feedback on it. Below is the changelog with all new features, improvements, and fixes!

Your team at Zero Point Software

What's New

ADDED: Grace period to Hell Week. If you die within the grace period you will respawn with an empty backpack
ADDED: Game now pauses in Single player when in the main menu (thanks Keavon! :))
ADDED: First version of falling damage, we'll tweak this as we receive feedback from the community. Note, exhaustion level and impact angle affect amount of damage sustained
ADDED: Jump pads to several maps to ensure players dropping out of spawns do not take falling damage
ADDED: Initial functionality to Mission Overview in Hell Week (press M to access by default)
ADDED: Backpack is not dropped in Hell Week if the player has not collected anything
ADDED: Zone markers in Deadlock have been reset back to their original versions
ADDED: Button to reset keybinds to default in Settings menu
ADDED: Debug info to Help menu (press U to access by default)
ADDED: Screenshot button which takes hi-rez screenshots. Note, this will cause a pause in your gameplay (press numpad * by default)
ADDED: Randomised exit point to Starcrown
ADDED: Randomised entry spawn point to Starcrown
ADDED: Chat in Hell Week now appears across all servers
ADDED: Error message to the log if something goes wrong recording your TPs
ADDED: Tutorial map is now locked to Normal difficulty


UPDATED: To Unity version 5.1.3p1
UPDATED: Coop poster scene to include missing items
UPDATED: Water across all levels to work properly
UPDATED: CTR default names to CTR from Unnamed. Added 1 in 20 chance of the name being a dev, and 1 in 1000 chance of killing ZPS.Hicks
UPDATED: Slope height on stairs throughout most maps to ensure smooth movement
UPDATED: Mainline spawns raised to stop players from jumping into them
UPDATED: SMG, AR, Marine and other local sound reverb
UPDATED: Small amount of red in the red dot glass
UPDATED: Burst and Auto fire now use the single shot sound for the first sound
UPDATED: Arch to fix occlusion errors on railing cover plates
UPDATED: Assault Rifle mag to hold 21 rounds to accomdate burst fire


FIXED: "Stamina being affected by ping time"
FIXED: "Jump to help smooth-out jumping on dynamic platforms"
FIXED: "Combat Points not recording after Hell Week matches"
FIXED: "Hell Week wins not recording after Hell Week matches"
FIXED: "If a player has collected pistol ammo in Hell Week, the ammo will be included in his dropped backpack"
FIXED: "Vertical bouncing on moving elevators and platforms"
FIXED: "Exploding ragdoll on Marines and CTRs"
FIXED: "Rock shader"
FIXED: "Particles disappearing when looking towards the ground"
FIXED: "Certain stairs on Rupture not working"
FIXED: "Server browser not sorting Multiplayer servers correctly after viewing Hell Week servers"
FIXED: "Survival challenges not correctly recording data to Steam achievements"
FIXED: "Multiple fixes across Starcrown, including AI, navmesh, stairs etc."
FIXED: "Meshes missing colliders on Lunar"
FIXED: "Tree missing textures in Welcome to IM"

23 comments Read more
See all discussions

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

Interstellar Marines

Frontliner Edition is an Early Access exclusive. Your Purchase includes:

  • Early Access – be part of the development of Interstellar Marines and provide your feedback and suggestions as we expand the game update after update.
  • Frontliner identity - An early access exclusive profile on our site and in Interstellar Marines.*
  • Upgradable - No need to re-buy, you can own Spearhead Edition with a simple upgrade.
  • All In – receive all future updates and expansions completely free of charge.
*Not available yet

Interstellar Marines - Spearhead Edition

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

  • Spearhead identity – A unique honorary game profile that with time will grant you access to special skins, helmets, and weapons. (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.
  • Extra Steam Key – You’ll receive an additional copy of Interstellar Marines to trade or gift to a friend.
  • Access to Beta Builds of New Updates – Occasionally Spearhead owners receive access to early beta builds of new updates before they're released publicly, allowing you to experience new content in advance!
  • Digital Art Books – Download digital PDFs released periodically, filled with high resolution concept art, screenshots and behind the scenes information.*
  • 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

Making The Game

We'll be posting development progress on our Trello board, allowing you to see what we're working on and give some input on what we're doing and what you'd like to see.

About This Game

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
40 of 54 people (74%) found this review helpful
1 person found this review funny
1.4 hrs on record
Posted: September 11
Early Access Review
Been in early access for 2 years...

It was fun to be all stealthy and sneak in the dark and kill dudes but the updates are so rare that its not worth getting at its current state.
Was this review helpful? Yes No Funny
43 of 61 people (70%) found this review helpful
1 person found this review funny
8.3 hrs on record
Posted: September 9
Early Access Review
December 25, 2046 Interstellar Marines finally comes out of early access! The full game will be offically released on June 22nd 2069! Aw sick! I really want a refund!
Was this review helpful? Yes No Funny
31 of 41 people (76%) found this review helpful
1 person found this review funny
3.2 hrs on record
Posted: September 8
Early Access Review
Just read this:

Dev is threatening and banning customers with complaints, don't support such behavior, don't give them your hard earned money.
Was this review helpful? Yes No Funny
23 of 30 people (77%) found this review helpful
3.0 hrs on record
Posted: September 18
Early Access Review
Played it during a free weekend. It wasn't terrible, but there wasn't much to do. No weapon variation, and everything was just "Combat Training." Would not recommend until it's updated with more variety.
Was this review helpful? Yes No Funny
31 of 45 people (69%) found this review helpful
1 person found this review funny
21.7 hrs on record
Posted: September 8
Early Access Review
Toxic Community, a DEV that takes sides with the "Elite Few."

- Never delivers anything when they claim too.
- Excuses everywhere.
- New game companies and indie devs finish their games, not this one.
- Beware potential buyers. ( You WILL regret it ) most do.
- Inactive community aside from the community puppets.
- Empty Servers ( Check )
- Elitism for no reason and personal attacks,
when you call them out. ( Check )
- Vapor-ware ( Check )

Have Fun getting your money back. 10/10
Was this review helpful? Yes No Funny