(adsbygoogle = window.adsbygoogle || []).push({}); Can anyone explain the perks in nuketown zombies

Look at my Nuketown zombies Survival guide, it should explain it there

random things drop when a siren type of sound goes off look in the sky you should see something fall and there not always in the same spot

Round 1-4: 1 perk or pap drops
Round 5-9: 1 perk or pap drops
Round 10-14: 1 perk or pap drops
Round 15-19: 1 perk or pap drops
Round 20-24: 1 perk or pap drops

Only the basic 4 perks Drop Jug, SC, DT, and QR

it is said that when the clock reaches on 0 it gives you a perk them the clock timer resets ....it is not a clock on the wall it is BIG and hanging outside the map