Some challenge dont unlock after i make it. Like doing 30 round whit only two shot with the mystery box. And another one is unlock the punchmachine for the first time. I play zombie for minimum 250 hour for now and i upgrad a lot of gun so why i can unlock this challenge? I play solo all the time 4 your information so nobody unlock the punchmachine exept me. Can u help me please whit my problem.