

Through this blending of its gameplay and storyline, Half-Life comments on the nature of free will in games, suggesting that choice is never more than an illusion in a video game if the G-Man represents the designers of a game then, just as Gordon is never free due to the G-Man's manipulation, the players of a video game can never be free due to the manipulation of the designers. This choice proves to simply be an illusion, however, as no matter what choice Gordon (the player) makes, the events of Half-Life 2 still occur, and Gordon still ends up working for the G-Man the choice at the end of the game is ultimately irrelevant, as the course of the series has already been determined (in-universe by the G-Man, and in the real world by Valve themselves). Similarly, at the end of the original Half-Life, Gordon is offered the apparent "choice" of whether or not to work for the G-Man. This represents how the developers of a video game design the path the player takes and the location at which the player enters the game, thus ensuring the players see only what was intended. Within the story, the G-Man places Gordon in the proper location at the proper time, and invisibly guides the player through, ensuring that Gordon always ends up where he needs to be. The gameplay itself adheres to this theme, as although the level design often gives the illusion of a larger world with multiple paths, the game is in fact very linear. Half-Life 2 could be seen as a deconstruction of the notions of free will and player agency within the confines of a video game, with the G-Man serving as a metaphor for the game's developers, who are guiding the player's experience at all times even if it appears otherwise. Gordon Freeman's name (Freeman coming from "free man"), as well as the 'One Free Man' label apparently given to him by the Resistance, is meant to be ironic: It is shown that Gordon is not, in fact, a "free man", but a puppet of the G-Man. Throughout the series it is left ambiguous whether or not Gordon Freeman has any free will at all.

The idea of linearity, and a "lack of choice," is one of the Half-Life series' fundamental themes.

"Rather than offer you the illusion of free choice, I will take the liberty of choosing for you." ― The G-Man
