Game subsystem: persistent game manager with auto-init

SETUP: Create Blueprint inheriting UGameInstanceSubsystem (or UWorldSubsystem for level-scoped). Override Initialize(Collection) to set up. Override Deinitialize to clean up. Add game variables here (Score, PlayTime, Settings). ACCESS FROM ANYWHERE: GetGameInstance → GetSubsystem(BP_GameSubsystem) → CastTo<BP_GameSubsystem> → access variables. WHY: Subsystems auto-create, auto-destroy, and don't need FindActor. Better than GameInstance for well-organized systems. UGameInstanceSubsystem persists across levels. UWorldSubsystem is recreated each level.

GetGameState — get current game state

GetGameInstance — get persistent game instance

UGameplayStatics::GetGameInstance. Persists across level loads.

SetGamePaused — pause or unpause the game

UGameplayStatics::SetGamePaused.

GetGameMode — get current game mode

UGameplayStatics::GetGameMode. Cast to your custom GameMode class.

Possess — make a Controller possess a Pawn

GameMode

Defines the rules + default classes (Pawn, PlayerController, GameState) for a level. Only exists on the server.

QuitGame — exit the game application

Pawn

An Actor that can be possessed by a Controller. Use for the player's avatar and AI agents.

GetPlayerPawn — get player pawn by index