Overall this is an entertaining game, but be warned - to get in top 50 in events, build hero's strength, get to plasma+ levels quickly means spending money = those with no money worries get far V.quickly, & some turn nasty & attack for resources. Another point is that the devs don't listen AT ALL, i.e there's buildings no longer in use that for some bizarre reason thy won't add the option for us to delete, they purely care about money, that's it. If you want to fight zombies this is the game.