my story started when i played custem game my rank was a skull with 4 slashes i played survival in town and i reached round 42 then i killed my self i my rank become a skull with knife!!!!!!!!!!! from skull alone to skull with knife with 4 slashes so my advice to u if u want to rank up in zombie play custem games . if you couldn't survive use master131's hacks, his hacks rocks .
so this is my story i will keep playing in custem games to level up,but it will not show in the leaderboard.
Thank me if i helped you