| Adverts |
| You will be rewarded with a treasure chest full of loot if you watch the adverts whenever you are given the option. |
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| Consumables |
| 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. |
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| Headshots |
| 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. |
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| Stars |
| 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. |
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| Upgrades |
| 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. |
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| Z-indicator |
| 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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