The truster is an entity that is capable of exerting a force in a similar way to a rocket or jet-engine. A thruster can be spawned by the player using the Tool Gun. The amount of force a thruster has can be edited by the player in the Spawn Menu, in the tool options. Unlike jets and rockets in real life, the thruster can exert force both forwards and backwards. The keys used to control the thruster can be edited in the Spawn Menu by the player. In addition, the sound that the thruster makes when active can also be selected, along with the effect emitted by the thruster. The model of the thruster can also be adjusted in the same menu. If the "toggle" box is checked, the thruster will continue firing until the button that controls it is pressed again.