You will be rewarded with a treasure chest full of loot if you watch the adverts whenever you are given the option.
Items such as multirockets and the medkits and obtained through cards or by spending gold, the game's premium currency. Save them until you absolutely must use them to progress.
The easiest way to take down the giant zombies is to use an adrenaline boost. The adrenaline boost will slow down time making it easier to dodge them and also increase the damage you inflict when you empty a few rounds into the monster.
Target zombies for headshots to do extra damage, and usually get a one hit kill. This will also earn bonus experience. This is best done with manual fire enabled in order to avoid accidently hitting other body parts while you try to aim.
Make sure you are paying attention to what is happening around you as lack of awareness can cost you in missed opportunities. For example when you sometimes kill a zombie it will drop pickups that can range from extra Experience to health.
Try to chain your shots when you use the sniper rifle as it is powerful enough to pierce multiple zombies from afar with one bullet. It does not matter what part of the body the bullet hits the zombie will die if hit.
Each level has three possible stars that can be earned. The first star is reward for completing the level. The remaining two stars are earned by completing the optional objectives. Earning the additional stars results in more experience and money.
Your main gun will be your most often used weapon. Upgrade it whenever you have enough money. You can boost its accuracy, power, and other stats.
When a zombie is nearby but not in your direct line of sight, a white skull will appear near your crosshairs to show its location. The skull will be red if that zombie is very close and in attack range.
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