If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The terrorist are attacking U.S army base. you are responsible to defense the base without let it fall into hand of
terrorist hand. Kill as many terrorist as you can to collect money to buy upgrade on your weapon,defense wall and reinforcement.
Dont shoot the doctor as they will give you jewel in return.
Use mouse to aim and shoot.