Reliable

Marks an RPC as guaranteed-delivery (TCP-like). Without it RPCs may drop on bad networks. Use sparingly — reliable RPCs are slower.

RandomBoolWithWeight — random bool with probability weight

Weight 0.0=always false, 1.0=always true, 0.5=50%.

RandomBool — return random true or false

IsValid

Returns True if an Object Reference points to a live (non-destroyed) UObject. Always IsValid-check references before use to avoid crashes.

IsValid — check if object reference is valid and not pending kill

UKismetSystemLibrary::IsValid. Also check IsValidMacro for exec-based branching (Is Valid + Branch combined).

IsValid — check if object reference is valid (not null or pending kill)

IsValid is a MACRO with two exec outputs: 'Is Valid' and 'Is Not Valid'. NOT a pure bool function.

BooleanAND — logical AND

OR=BooleanOR, NOT=Not_PreBool, XOR=BooleanXOR

IsValid macro — check validity with exec branch outputs

K2Node_MacroInstance from StandardMacros. Has exec pins unlike the pure IsValid function.

Checkpoint and autosave system with trigger volumes

Pattern: BP_Checkpoint with BoxTrigger, variable CheckpointID(int). OnBeginOverlap(Player) → DoOnce → CreateSaveGameObject(MySaveGame) → SET PlayerLocation, Health, Inventory, CheckpointID → SaveGameToSlot('AutoSave', 0). On death/respawn: LoadGameFromSlot('AutoSave') → Cast → TeleportTo(SavedLocation) → restore Health etc. Show 'Checkpoint Reached' UI briefly.

NearlyEqual float — check if two floats are approximately equal