Collect the brains to get second chance when your knife flip and lose, keep shooting all the way to the zombie boss, or unlock more special knives.
Don’t get distracted by the zombie boss’ music track or scary hits’ sounds, shoot and keep shooting to win and move to the next level.
There are many zombies and monsters’ bosses’ levels, when you shoot a boss to death, you will get the unique knife, it is a part of the legend zombie himself, get it and shoot it into them.