Dear Gamer, please watch this ads while your game is loading. Thanks!
Use the mouse to shoot and R button to reload.
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You have to shoot all your enemies appearing in your sight. Green crosshairs mean you can shoot. Red crosshairs mean you are either hit or hiding behind and obstacle. There is automatic reload, but you can press R KEY to reload as well.