To Save the Guy, you need to cut the zombies and shoot the ghosts. Or the zombie will bite the guy and the ghost will throw out a big Bomb. You can cut the zombies into as much pieces as you can to get more combos. And you can upgrade your knife or buy a protector in the store!

Click on the weapon icon right down corner, or use SPACE BAR to switch weapons. When choose KNIFE, swipe your mouse across the screen to cut the Zombie into pieces. When choose GUN, anim to shoot the Ghost and the Bombs.