To pass each level your task is to destroy the enemy's main tank. The more enemies you kill, the more money and points You'll be able to earn and You'll be able to improve your ranking. If you did not get enough money needed to upgrade Your tank,money will not reset and you can continue to gather up enough money to upgrade your tank.
Arrow keys to move or W,A,S,D.Spacebar - switch weapons.Ctrl - show or close map.Mouse - move mouse to aim,left click to fire.Move your mouse to make view distance wider in oneor another direction.
The game can be played here
Direct link to .swf
Click image for larger version. 

Name:	tank-warfare-icon-1.jpg 
Views:	93 
Size:	6.7 KB 
ID:	17870

Best regards Varde.