At the beginning of the adventure, you emerge from your nuclear shelter and find yourself in a devastated world where mutant zombies will be the least of your problems. It's not just that there are more dangerous creatures in the world, but also that you will face more immediate problems like hunger and exhaustion.
The gameplay for Cataclysm Dark Days Ahead can vary a lot depending on the type of characters you create and the circumstances that arise during the adventure (random or user-selected). You can try to go to the forest and live far away from all of these problems... or go to town to try to find supplies... or even construct a fortress to protect you from attackers.
Cataclysm Dark Days Ahead is a wonderful, gigantic role-playing game, whose complexity leaves many other similar games in the dust. The only problem is that, just like with many other 'roguelike' gmaes, the graphics are very basic and are made up entirely of ASCII characters. If you can get past this setback, you will find yourself in front of an almost never-ending game.