Lacks ANY directions on how to expand across the Map. Towers, Factories, etc. However building up your base and kill a few zombites when you can find someone in your team to play with is cool. Just takes a looong time to build up your levels. I finally broke down to spend $5 on a 2nd build slot, but that is the last dime I invest. :) The game is ok, because you can click a few things when you have so spare time.