Last night I was playing Nuketown and I heard someone on Youtube say that if you get a 160 kill to down ratio you can get the shotguns. Of course you can't believe everything you hear, but this sounded interesting. I went to the Leaderboards and found out my Kill to Downs ratio was 75. So I decided to play Survival Solo on Nuketown and Town to boost my rank up. Each game I got to round 20 and 600 kills a game. It took me a whole day to get to a 95 Kill to Down. Well I kept playing and the next game I got a 96 Kill to Down ratio and I received the Skull with the Dagger and Blue Eyes Rank (I was the Skull with Blue Eyes before the game). So I thought to myself that at 96 Kill to Down you get that rank. My friend had a 95 kill to down and the next game he played he got a 96 and he got the same rank as me. So this is my Hypothesis saying that Kill to Down contributes to your rank for zombies. Post below what your rank is and what your Kill to Downs ratio is. Be sure it's not your Kill to Death.