If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Frontline Defender is an action-packed strategy-shooter game! Your city is under siege from enemy troops and things look desperate as your soldiers have fallen back, with only a small barricade to protect them. Everything's on your shoulders now! Pick up the slack of your fellow soldiers and shoot any remaining enemies upon sight! It's time to shape up your soldiers, tighten up your defenses and sharpen your aim as you defend the ruins of your once glorious city!