As a simulation, "Starsiege" offers players the ability to pilot a wide variety of massive bipedal war machines known as "HERCULAN"s (Humaniform-Emulation Roboticized Combat Unit with Leg-Articulated Navigation) (or 'HERCs' for short), as well as several tanks. Set in 2829, "Starsiege" contains an array of advanced technology, and numerous upgrades are available for each vehicle. "Starsiege" takes place across a number of planets and moons in the solar system, offering a range of different locations throughout the game and in multiplayer battles, including Earth, Titan, Luna, Mars, Venus, and Mercury. There are two campaigns, Human and Cybrid.