Gameplay in "Starsiege" revolves around mechanized combat - piloting HERCs and tanks in combat against opposing vehicles. Both types of vehicles can be controlled via any combination of keyboard, joystick, or mouse input. Starsiege abandoned the "torso-twist" gameplay mechanic common in many mecha simulations (including preceding games in the series), a feature that would normally allow the user to swivel the HERC's upper body independently of its legs. In Starsiege, torso orientation is fixed forward, but the player can move the aiming recticle across the screen with a mouse, a feature GameSpot compared to playing a first-person shooter. In both campaigns, the player is eventually assigned squadmates and is able to issue basic commands to them.