There are four types of zombies based on their colors. White, Red, Blue and Black.
White Zombies: They move at a normal speed but they have the most population in the game.
Blue Zombies: I can't think of anything with the difference with the white except for its color and population.
Red Zombies: They are more faster than the white zombies.
Black Zombies: Slow walking speed but they will chase you whenever you go.
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