I saw this thread once back on the TV Tropes forums, so allow me to explain.
Each post is another floor of the tower. Each one is numbered, so do keep track of the number of posts. Also, NO DELETIONS. (One exception: If you get ninja'd, you may either delete or edit your post at your discretion.) Aside from that, I would try to avoid posting the same thing twice in the same thread, but that may become impossible as the thread becomes longer and longer. Just try to keep that in mind.
As for where each boss battle comes from, that's up to you, but you must post a solution to the previous poster's battle before posting your own floor.
Alright, enough talk. Let's do this.
First floor: Upon entering the tower, you see before you an M24 Chaffee tank and a large open field stretching out far as the eye can see. You enter the tank and receive the order "Time to roll out!" Your tank is alone but fully crewed, and soon you come face to face with a German Panzerkampfwagen VIII Maus super heavy tank. You must destroy it in order to advance to the next floor of the tower.