Bounzy 2, a fantastic shooting game on www.flash-game.net, will be your best choice. Aiming for a headshot gives more points. Try to kill 45 chickens and 55 crates. Kill zombies to unlock new weapons. Aim for the indicated area to destroy the horde of zombies. That helmet seems to protect the zombie from bullets. Maybe there is another way to kill it. Those crates contain homing missiles. Use the mouse the control their direction. Good luck!