Board Thread:Questions and Answers/@comment-174.106.150.22-20130822124040/@comment-216.237.73.123-20140413201129

On the IOS version I have:

Dart Training Facility, Mage Spire, Mortar Emplacement, Ace Private Hangar, Pirate Cove, Glue Supply Dump, Engineers Workshop, and 3/4 of the Dartling Ammo Dump.

My favorites are the Pirate Cove (shoots powerful fireballs and allows all nearby towers to see camo balloons), the Glue Supply Dump (all balloons that get popped while glued leave glue on the track, so you pretty much glue every single balloon... which is incredible when you upgrade the Glue Gunner 4|2), and the Engineers Workshop (creates mega turrents)