BTD4

I am a great fan of the bloons series, and much to my excitement, BTD4 came out a few days ago. It has some differences over the onld BTD's but not many. New tracks and towers as always, but a new system of unlocking towers. The ranking system adds another prerequisite to purchasing a tower. More difficulties in this game also. All in all, a game wotrth checking out. I give it 4.5/5.