This strategy involves using no items.
This map features two different paths for enemies. These paths meet at a turnpike which both enemies will spin around and then leave at different location. This map also features airplanes which will only fly east-west through the direct centre of the map.
Many towers are used in this strategy. Make sure you have equipped gattling tower, rocket tower, oil tower, hive tower, pyro tower, and tesla tower.
Start off by building a gattling turret and then fully upgrading it. Build it at the green square in the middle for maximum punch. Add 2-3 gattling turrets over time.
After this add a rocket tower slightly to the south and a oil tower in the middle to snare them as they move around the turnpikes. Maximum upgrading this tower will give great effect.
Continuing building rocket towers as close to the middle as possible until you have 5-6 of them. After this start adding in some hive towers 2-3 of them.
After this save up and purchase a pyro tower. They cost 90 and are quite expensive. Alternatively you can sell two rocket towers and a gattling tower to build it. The pyro tower should go where your original gattling tower is.
You will want a second pyro tower located to the east of this making sure that the pyro towers have plenty of snares around them for maximum damage.
Add a tesla tower at the very end of the mazes making sure it hits both paths. The tesla tower does very high damage and will act as a finisher for anything that gets through your maze.
Adding another pyro flower along the main travel path will make it so you can finish off the Final Wave.
Good luck gents.