The 3D rupture
Forty-one mechanics originate here, more than any other period, because 3D invalidated solved problems and forced the medium to re-answer them. Quake supplies true polygonal space and the authoritative client-server model in one release. Super Mario 64 supplies four, among them Analog Free-Roam 3D Movement, Trailing Follow Camera, and Graded Analog Input, and creates the camera problem that Resident Evil answers with fixed angles and Ocarina of Time answers with lock-on targeting. Diablo contributes four, including Branching Skill Tree and Colour-Coded Loot Rarity, and Ultima Online contributes the Persistent Shared World with an economy and a society inside it. 1998 is remarkable on its own: Metal Gear Solid's Graduated Alert States and Explicit Detection Feedback, Thief's Light-and-Shadow Stealth and Diegetic 3D Audio Information, Rainbow Six's iron sights, Baldur's Gate's quest journal, and Trespasser's ragdolls. System Shock had already solved storytelling without cutscenes through Environmental Storytelling and the Found Audio Log, an answer the industry is still using.