To get "The Divide challenge" where it requires to deal over 250000 damage you have to adjust the battle settings with +30 more waves, double enemy health and double enemies per wave and it is not necessary to increase the enemies armor in order to succeed.
For the last mission Alien Campaing.Weapons you need:ripper,magnum,shotgun,precison laser,HOLY GRAIL,destroyer and ROCKET LAUNCHER(Holy Grail and rocket launcher are the best weapons that can kill THE RAZE SOLDIER).USE Static Shield to save your live when you are surronded by 2+ Enemies.EQuipment:Adrenaline boost,power extender(to exdend powers that you gather during the battle like invicibility,rapid shot etc. and hair trigger).When you are in the battlefield pick good weapons like ROCKEt or HOLY GRAIL and stalk only the Raze soldier.Do not waste time on other soldiers(you have to kill the raze soldier 10 times and you have got only 4 minutes.Lets say raze has 5 lives and you have 1 minute left which is critical situation).KIll them only if they come at you.Always pick Powers over the map.
 "Hands of War Tower Defense"){kind=icon}
 "Kingdom Rush"){kind=icon}
 "Epic War 3"){kind=icon}
 "Bubble Tanks 2"){kind=icon}
 "Raze 2"){kind=icon}