How do games organize large amounts of varied content?

There is no single architecture that makes a large game small. Games genuinely contain a lot of code, art, audio, rules, and one-off content. The important part is to separate reusable systems from authored content, make behaviors modular where that helps, and avoid designing abstractions for every hypothetical future feature. Start with the actual problem in front of you, keep data external when it is mostly configuration, and introduce interfaces or components when several things really share behavior.

Composition is another useful way to handle variation. Instead of making a separate class for every kind of object, build entities out of reusable parts such as health, collision, inventory, interaction, damage, or dialogue components. A coin might have collision, pickup, and score-related behavior, while an enemy might combine health, movement, attack, and collision. Components can remain relatively independent, and an object only receives the capabilities it needs. This does not eliminate abstraction, but it reduces deep inheritance trees and makes unusual combinations possible.

Object-oriented programming is still widely used in games, but it works best when combined with interfaces, composition, and data-driven design. An NPC might expose health, movement, inventory, and damage-related behavior, while a vehicle could implement the same damage interface in a completely different way. The main systems call the shared interface instead of checking every concrete type with a long chain of conditionals. You may end up with many classes, but they should represent meaningful behavior rather than every individual piece of content.

A common approach is to keep the code generic and store the specific game content as data. For example, the code can define a Quest structure with fields for text, requirements, objectives, and rewards. Individual quests are then created from JSON, YAML, database records, or editor assets rather than each quest getting its own class. This makes it much easier to add hundreds of quests, items, or dialogue entries without constantly changing the program. Larger studios usually build tools that let designers edit this data more conveniently. The sheer volume of content is also normal—much of a finished game’s size and development effort is assets and authored data, not just systems code.

At a lower level, some engines use an entity list plus component storage. Systems query for entities that have the components they need and update only those entities. Items can be represented by generic item data and references or indexes in inventories rather than by a unique object hierarchy for every item. This style can be very efficient, but it is not mandatory for most projects. A straightforward mixture of ordinary objects, composition, interfaces, and external data is often easier to build and maintain.