This is your primary tool for placing multiple blocks at once.
If this is a specific numbered challenge from a curriculum (like a CTF or a programming lab):
If you are referring to the popular "Building Gadgets" mod (often part of larger quest packs), this topic usually covers the automation of complex structures.
Replaces existing blocks with new ones from your inventory without breaking them first. Essential for "re-skinning" a base.
Determine if the gadget can be "tricked" into a state it wasn't designed for (e.g., skipping a security check).