Everyone start with Level 1, and Level 2 is Moderator and Level 3 is Admin. If you can do these things, you will rank up!:

Rank 1: join group

Rank 2: Play 7 diffrent Zombie Games in one week. (no other games!)
(needed proof, picture or anything else)

Rank 3: get all Achievements in all your zombie games. (not less than 7 games)

Rank 2 Different Shoice: name yourself something like "zombie" or have a picture of an Zombie, Skeleton or something "deadly".

Rank 3 Different Shoice: Play with the owner any game 3 times or one game 9 times on one week!