A lot of people seem to have a little confusion about the easter egg. In short, the easter egg is more of a choice you make on which staff you build than a traditional full fledged easter egg like what Treyarch does. Once one of them is built you cannot build the other until you play the map again. In regards to this, the easter egg is rather short, I wanted to create something inbetween challenging and casual. Once you have obtained a staff though, the "main easter egg" is done and the next challenge would be to upgrade the staff. I hope this clears up some confusion.