Interface & Meta
Maps, markers, journals, and difficulty menus — ten mechanics negotiating how much a game should tell you before play stops being yours.
Dune II makes information itself contestable with Fog of War, and every scouting layer in strategy descends from it. Doom externalizes spatial memory a year later with the In-Game Automap, which is what makes large levels tractable, and Halo turns that into the Persistent Minimap / Radar, a corner display so useful that competitive players watch it more than the world. Grand Theft Auto III's Waypoint Objective Marker makes open worlds navigable and, in the same stroke, makes exploring them optional.
A quieter thread concerns bookkeeping. Diablo's Spatial Inventory Grid makes carrying capacity a packing puzzle so that leaving something behind is a real decision. Baldur's Gate's Quest Journal has the game track what you were told, which is what permits nonlinear questing without a notepad beside the keyboard.
Contracts with the player form the third thread, and the most contested. Doom's Selectable Difficulty lets players declare their own terms up front, separating access from challenge for the first time. Perfect Dark Zero attaches Platform Achievements to an account rather than a cabinet, rebuilding Asteroids' high-score table as a cross-game identity. Dead Space argues against the whole apparatus with its Diegetic HUD-less Interface — health on the spine, ammo on the gun — treating information as an immersion problem. The Last of Us Part II reframes the argument entirely with its Comprehensive Accessibility Suite, where difficulty is one axis of access among many rather than a single slider, which is the strongest recent answer to a question Doom opened in 1993.
The family, in order of arrival
Every mechanic in this family
Inherited from other families
Mechanics outside this family that parent something inside it — where the cross-pollination happens.