ok i have the ultimate strategy for the open maps what you have to do is make the lane go to the top and to the bottom all the way till the end but you cant stop to upgrade or else they will break through the recommende upgrades would have to be atleast 1 sniper on farthest area burst on the ends and poisons then the rest would be up to you
 "Bubble Tanks Tower Defense 2"){kind=icon}
 "Mastermind: World Conquerer"){kind=icon}