Hey guys, welcome back—this is Part 9 of my Horror Escape Game series in Unreal Engine 5, and in this video I build the full lock system for the main gate where you need to unlock multiple locks before you can escape the house. I start by modifying my old door/key setup: instead of checking an array of collected keys, I keep it simple because in this game you only hold one item at a time. So I just compare the collected item name with the door/lock name, clean up the locked message, and test it quickly so you can see the pairing is working. After that I convert the main gate from a static mesh into a proper Blueprint setup. I create a Gate Door BP (based on my base interactable), then I build a Main Gate BP that contains two child gate actors, and I rotate both doors correctly (one side uses -80 and the other side multiplies by -1 because it’s flipped). Then I add three types of locks (two log locks + two wooden planks) using a Base Lock BP and child blueprints. When a lock is opened, I simulate physics and add impulse so the lock drops down. Finally, I solve the “how does the gate know all locks are unlocked?” problem using tags: each unlocked lock adds an “unlocked” tag to the parent Main Gate BP. On interact, I run a function that counts lock components by tag and compares that with how many “unlocked” tags exist—only then I set the gate to unlocked and allow it to open. I also slow down the door timeline to make the opening feel better, and I show how I tag drawer tables so the starter room key always spawns where the player begins.