If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You are in the Kobra Team, try to defend the compound, it is under attack by zoombies. Kill enemies, they will drop weapons and health, collect it and use it. Enjoy with Kobra Team: Horde Attack online action games.
W,A,S,D - Move.
Mouse - Aim / Shoot.
R - Reload.