Board Thread:Questions and Answers/@comment-5961205-20140518163346/@comment-10824019-20140518223138

Well, being a member of the Pixel Gun 3D Forums, we have some Android users there. I can safely tell you what the ranks past 11 are:

Rank 11: Skull

Rank 12: Red Skull (I think)

Rank 13: Black Skull with horns.

The first two I'm a bit iffy on, but the last one I know for certian.