In order to win the Alien Dead City challenge, also known as ADC, you will have to be lucky and have skill. Here is some of my experience I will share with you, if you have any suggestions, feel free to notify me in the Message Wall in my profile, thank you for your support.
The first thing you will need to do is find weapons and keep an eye on the timer! Here are some places to find good loot:
1) The junkyard of cars: there are many different types of ammo and guns in here, there may also be some armor or bags in the little house up front (could be hiding behind the counter). Be sure to look into every crook and cranny!
Click on the image below to see details:
2) The basketball court: there definitely will be different bags and armor there, there may also be heals, so it's an ideal place for getting stacked up :D. The main way you can find it is by trying to look for its iconic basketball hoop and the iron fence, it is not far from the junkyard mentioned above.
Click on the image below to see details:
