Welcome to That's Not My Neighbor. In this game, your goal is to let in the real people and exterminate the doppelgangers, or "Dopples". To find out if the person at the window is a real person or a Dopple, you check their ID and compare it with their floor folder. Their ID number should be the same as the one on their floor file. Also, check the D.D.D. logo. It should have three arrows in the middle and three wings on each side. If everything adds up, you can click the green button in the bottom right corner to open the gate and let them through and then close it after they have safely passed by clicking the red one. But make sure to also check their appearance, because some Dopples aren't so good at hiding their true identity. If you catch a Dopple, click the emergency button on the bottom right and call the D.D.D. Their number is 3312. The D.D.D. will come and dispose of the Dopple, and you can continue your job. If you accidentally call the D.D.D. on a real person, this will result in death. If you let in a Dopple, this will result in death. Good luck, new doorman!