Save and load game data with SaveGame class

Save: CreateSaveGameObject(MySaveGameClass) → Cast → SET variables → SaveGameToSlot(Object, SlotName, 0). Load: DoesSaveGameExist(SlotName, 0) → Branch → True: LoadGameFromSlot(SlotName, 0) → Cast to MySaveGame → GET variables. Put save/load logic in GameInstance for persistence across levels.

Level transition: save data then open new level

Pattern: custom trigger or UI button → [save player data to SaveSlot] → OpenLevel(LevelName='Level_02', bAbsolute=true, Options=''). For loading screen: SetGlobalTimeDilation(0.001) briefly while level loads (freeze world), or use AsyncLoadLevel with progress callback. Key: OpenLevel is in GameplayStatics. 'LevelName' is the map asset name (not full path). bAbsolute=true discards current level completely. Options string can pass params like '?GameMode=BP_GM'.

CreateSaveGameObject — create save game instance

UGameplayStatics::CreateSaveGameObject. Cast result to your SaveGame class.

Save and load player data using SaveGame blueprint

SAVE pattern: EventBeginPlay or custom → CreateSaveGameObject(SaveGameClass=BP_SaveGame) → CastTo<BP_SaveGame> → Set all variables on cast result → SaveGameToSlot(SaveGameObject=cast result, SlotName='SaveSlot1', UserIndex=0). LOAD pattern: DoesSaveGameExist(SlotName='SaveSlot1', UserIndex=0) → Branch → True → LoadGameFromSlot(SlotName='SaveSlot1', UserIndex=0) → IsValid → Is Valid → CastTo<BP_SaveGame> → read variables. Key pins: SaveGameToSlot inputs 'SaveGameObject' (SaveGame), 'SlotName' (string), 'UserIndex' (int). LoadGameFromSlot inputs 'SlotName' (string), 'UserIndex' (int), output 'ReturnValue' (SaveGame).

SaveGameToSlot — save a SaveGame object to disk

SlotName is an arbitrary string key (e.g. 'SaveSlot1'). UserIndex 0 for single-player.

SaveGameToSlot — save game data to named slot

SaveGameToSlot references a SaveGame class that was deleted

Why: Your save logic targets the SaveGame class '{cls}', but that asset is gone. The save call would fail at runtime. Fix: Find your existing SaveGame subclass in Content Browser (search for 'SaveGame'). If still there but renamed: update the Cast To node + Class pin. If gone: create a new SaveGame Blueprint (Right-click → Blueprint Class → SaveGame parent), copy your fields back, and re-point save/load calls at it.

DoesSaveGameExist — check if save slot exists

DoesSaveGameExist — check if a save slot exists on disk

SaveGameToSlot

Writes a SaveGame instance to a named slot on disk. LoadGameFromSlot reads it back. Choose unique slot names per save file.