Unreal Engine Blueprints Cheat Sheet 2026

The 30 highest-yield Unreal Engine Blueprints facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which Blueprint node locks rotation on specific axes to prevent a physics body from spinning unintentionally? → Set Locked Axes (via Physics Body or Constraint)
2. What does the construction script do when a blueprint is not edited? → Executes
3. What can you do with a "Vertical Box" Widget? → Neatly stack many "child" widgets inside of it and on top of one another
4. Which Blueprint node performs a single-hit line trace and returns the first blocking hit along a ray? → Line Trace By Channel
5. Which Blueprint node retrieves the current linear velocity of a physics-simulated Primitive Component? → Get Linear Velocity
6. What is the result of a 'Cast To' node in a Blueprint graph when the object being checked is NOT of the specified class? → The 'Cast Failed' execution pin fires, and the object output pin is null.
7. What can you use the output pins for? → Work with the Other Actor’s output
8. Which Blueprint node can detect all actors of a given object type within a sphere radius in the world? → Sphere Overlap Actors
9. Which Blueprint component is used to create a physics joint between two actors or components? → Physics Constraint Component
10. Which of the following can have multiple input AND multiple output execution pins, allowing for complex branching logic within a single node? → A Macro
11. Which collision preset allows a projectile to detect overlapping actors without physically blocking them? → OverlapAll
12. What software design principle do Blueprint Interfaces support by letting unrelated classes share a callable contract without class inheritance? → Programming to an interface enabling polymorphism without coupling to concrete classes
13. Which collision preset is best suited for an invisible volume that should block all actors from passing through? → BlockAll
14. What is the primary function of the 'Update' execution pin on a Timeline node in a Blueprint graph? → It executes every frame that the Timeline is actively playing.
15. Which Blueprint node enables physics simulation on a Static Mesh Component at runtime? → Set Simulate Physics
16. What happens when you call a Blueprint Interface function on an actor that does NOT implement that interface? → The call is silently ignored with no error or crash
17. What does right-clicking a variable in the My Blueprint panel and selecting 'Watch This Value' do? → Displays the variable's live value in the Blueprint Debugger during PIE
18. To what do you compare the doors in an opened Blueprint? → Level Blueprint sequence
19. What does the 'Replication' setting on a Blueprint variable control? → Whether and how the variable is synchronized from server to clients over the network
20. What does Continuous Collision Detection (CCD) primarily prevent in Unreal Engine physics? → Fast-moving objects tunneling through thin geometry
21. What does marking a Blueprint variable as 'Expose on Spawn' enable? → The variable can be set as a pin directly on the Spawn Actor from Class node
22. What happens when you right-click a Blueprint node and select 'Add Breakpoint'? → PIE execution pauses when that node is reached so you can inspect values
23. Which Unreal Engine profiling tool provides a hierarchical CPU timing view including Blueprint function call costs? → Unreal Insights
24. What tool allows you to create games without looking at code? → Blueprints
25. What does the Widget Blueprint Editor's section "3" do? → Switches the Widget Blueprint Editor between Designer and Graph modes.
26. Which node checks at runtime whether an actor implements a specific Blueprint Interface before calling its functions? → Does Implement Interface
27. What does the 'BlueprintCallable' UFUNCTION specifier do in C++ code? → Exposes the C++ function as a callable node in Blueprint graphs
28. Which Blueprint asset type consolidates reusable static utility functions callable from any Blueprint in the project? → Blueprint Function Library
29. Which of the following track types can be added to a Timeline specifically to trigger a new, named execution pin on the node at a precise moment in time? → An Event Track
30. What does the 'On Component Hit' event provide that 'On Component Begin Overlap' does not? → Hit result data including impact normal and impulse