SetInputMode GameAndUI — allow both game and UI input

SetInputModeGameAndUI — set input for both game and UI

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

AddToViewport — add widget to the game viewport

UUserWidget::AddToViewport.

GetGameState — get the current GameState

Pure node. Cast to your AGameState subclass to access custom replicated data.

GetGameInstance — get persistent game instance

UGameplayStatics::GetGameInstance. Persists across level loads.

GameMode

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

Possess — make a Controller possess a Pawn

GetPlayerPawn — get player pawn by index