BTD4 features improved graphics, loads of new and original tower types.
Heaps of tracks, save games, career mode, sandbox mode and apopalypse mode. Double boomerangs, exploding darts, and double cash!
Bloons Tower Defense 4 will give you almost unlimited replay value.
3 new tracks, brand new challenge mode with 2 challenges, and 2 new towers
The Dartling Gun and the Spike Factory!
BTD4 will guide you to play game!