Mouse controls Only.

Full Instructions can be found with the game.

Features:

* Path finding AI
* Open Battlefields
* Visual Upgrades on Towers
* Unlockable Achievements
* Medals

Tips:

* Upgrade as much as possible.
* Build complex paths using tower placments.
* Keep your best (most expensive) towers with range of the enemies flight paths.
* Large numbers of cheap towers can be as effective as fewer expensive towers.