1. The infecting process requires some thinking on where to click. You would want click on a spot with a lot of people.
2. There game is quite long because there are many regions to play with. Each region contains a handful of cities.
3. As you win more level, you get to upgrade your infection skills.
4. In addition, as you travel around the world, you get to collect and use elite zombies (such as Michael Jackson!)..
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