Interstellar Marines is a science fiction first-person shooter video game being developed by independent studio Zero Point Software. Its multiplayer is in development which will lay a foundation for its larger singleplayer/co-op campaign. The storyline is set in a "realistic and unpredictable future where first contact with another sentient species is slowly becoming reality." The campaign will support singleplayer and up to four players in drop-in/drop-out co-op. Zero Point Software claims that their co-op campaign will feature tactical gameplay, role-playing elements, open-ended level design, and a compelling sci-fi storyline. It claims to pay homage to old-school tactical first person shooters like Tom Clancy's Rainbow Six 3: Raven Shield and cites System Shock 2 and Deus Ex for their action RPG elements and open-ended levels and well as Half-Life for its first person narrative-driven storytelling. The game was released on Steam Early Access on July 2, 2013 in pre-alpha form with content updates aimed for release every three weeks. The Spearhead Edition costs more than the base game and is designed for users who wish to further support the developers and, in exchange, have their name included in the credits and access digital downloads of artwork and music among other extras. There will be several campaigns released as they are created and they will be made available at no extra cost to all existing owners. The first campaign is planned for release near the end of 2014.