This, the least surprising, but still interesting application will require you to strategic calculations, in order to defend against oncoming enemy troops. The main objective, to build towers along the road auto-responders, by which to move the tanks. After that, click the button start. With each new level, the enemy will become stronger, so you need all the time to build new tools for defense. Using a computer mouse and functional bottom panel, you can easily repulse the attack.