10: Gnarled Forest

Unlocked Tower: Needler

You have to watch out for the cactus enemies since the spirits they leave behind after their main body dies can still get past your defenses if not killed immediately, and can deal high damage to your base. As early as the second wave, there will be airborne ghosts that will come in from the west. Place at least one rocket tower beside the base and turn it to an AA Battery once your land defenses are established. Blamwitzers are pretty effective here since you’ll need as much tower coverage as possible. You don’t seem to need another needler except for the one mounted on your base. Take note that the Recon’s Mark ability can also make use of the needler’s projectiles, making it a potent weapon against the swarm of slow undead.