Whether you play the Zombie Apocalypse Survival War Z game alone or with other people, you can use a range of weapons.
This is true no matter if you play the game by yourself or with other people. Depending on how they are set up, a single person or a big group of people can play these games at the same time. In Construction, it looks like you have to protect yourself from dead robots on different worlds. There are a lot of different choices that you can choose for yourself.
You are needed to kill any other undead creatures you come across, whether you are armed or not and whether or not you are actively fighting zombies. Whether you are facing zombies or not, you still have to do this.