The mode defense in BTD Battles is the most challenging mode in the game. These strategies will help you during the gameplay. - wip-
The most important thing in the game is choosing a tower. Great for a defense, and a low price.
Glue Gunner:Extremely useless, and weak. Only makes bloons slower.
Terrible at both assault and defense. Only freezes bloons. (Darts can't shred through the bloons!)