Zombies do not like to be alone. so, they want to contaminate human beings to have many friends. you will help these cute little green and slimy zombies to achieve their awful goal in 24 levels. place the zombies next to a row or a column. they'll contaminate all humans who are in the directions indicated by the yellow arrows. however, you can't contaminate the doctors because they are immunized against the zombie virus. when all humans are zombies, you have the right to go to the next level.
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