In this episode of my third person shooter series, I am going to create a door unlocking system by entering a key code. Here, we will create a UI widget for the keypad and when player goes to a locked door and press E, the Keypad UI will appear and player will be able to insert a key code. If the entered code is correct, door will unlock and open. Otherwise, it will say "CODE ERROR". We have already implemented an intel reading system which can be used to give player the key code as an intel document player can read.