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.
If this is a specific numbered challenge from a curriculum (like a CTF or a programming lab): 18_its_just_a_gadget
Most "gadgets" in tech packs have a maximum block range (often 16–64 blocks). You can usually upgrade this in a specialized workbench. If you are referring to the popular "Building
Usually involves interacting with a "gadget" (a small piece of reusable code or a hardware interface) to achieve a specific output. Key Concepts: skipping a security check).
Determine if the gadget can be "tricked" into a state it wasn't designed for (e.g., skipping a security check).