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Ranking System
One Bone -> Two Bones
Get +500 kills.
Two Bones -> Skull
If you want to reach a skull before reaching 5,000 kills, get 50+ K.D. Ratio, if you FAIL;
Second mission is, reaching +5,000 kills.
A Skull -> Skull with knife
The first mission going to this rank is achieving 140+ K.D. Ratio before reaching 10,000 total kills, if you FAIL;
The second mission is achieving 120+ K.D. Ratio before 20,000, if you FAIL;
The third mission is that when you pass 20,000 kills, just get 90+ K.D. and you will promote to this rank.
Skull with knife -> Skull with Dual Shotguns
Now the k.d. theory is not 100% IN. If you're on a high kill count like 30,000 and still a skull with knife, then your mission will be reaching high rounds, probably few games of 40+ rounds survived (public match or solo only). This should work. If not, try to increase revive count if it's under 300 of them, and doors opened if it's under 200.