Narrative
How fiction is delivered and how much of it the player authors, from Pac-Man's wordless interludes to a story whose subject is your own compliance.
Fiction enters the arcade sideways. Pac-Man's Attract-Mode Premise establishes character in vignettes with no interaction at all, and two very different children follow: Dragon's Lair reduces play to a timed prompt over authored spectacle, and Karateka lets the engine take the controller to tell you something. Karateka's In-Engine Cutscene has been contested continuously for forty years and abandoned by nobody.
A second trunk starts with Ultima IV, which ships Branching Dialogue Trees and Explicit Morality Axis together in 1985 — conversation as navigable structure, and a game that scores your ethics. Fallout converts that axis into Faction Reputation, which asks whose side you are on rather than whether you are good, and gets world-state consequences in exchange. Baldur's Gate II gives party members private opinions with Companion Approval, which is why people replay it. Knights of the Old Republic makes accumulated choice reshape the final act instead of a closing slide.
Production values keep raising the stakes and narrowing the options. Night Trap's Full-Motion Video was a commercial dead end that permanently reset expectations; Wing Commander III's Full Voice Performance doubled emotional bandwidth and multiplied the cost of changing a line. Mass Effect's Cinematic Dialogue Wheel is the direct consequence — paraphrased intent, selected radially, so the camera never stops. System Shock had already proposed the cheaper answer, letting the level narrate through Environmental Storytelling and Found Audio Log. BioShock closes the argument by making the player's own obedience the subject, which is the medium doing something no other medium can.