While I don't expect you to believe me, and I wouldn't believe myself if I didn't do it, I just made it to round 252 with a score of 230588. I have been playing the game for 4-5 years and my father who plays it every day, struggles to make it to round 180. I did it on my little fortress on ground only with 5k start. My strategy can be used on any other map, it just takes some thinking. My strategy was to split the map in half with a entrance to the radar dish on both sides of the map. Build two defenses on both halves. Make sure the tanks can switch halves. Block one half. When the tanks get close to the unblocked half, switch the blocked half to unblocked and the blocked one to open. It helps to make a line of wall blocks where they come in to help clog up the tanks. When done successfully, people will call you buffy, because you will be a slayer. Please keep this comment alive.
 "Warzone tower defense"){kind=icon}
 "Learn to Fly 3"){kind=icon}
 "Warzone 2060"){kind=icon}