Kill a total of 1000 zombies.
Kill a total of 100 zombies.
Earn a total of 1000 coins.
Earn a total of 10000 coins.
Earn a total of 5000 coins.
Unlock 5 heroes
Play for a total of 3 days.
Play for a total of 30 days.
Play for a total of 7 days.
Play for a total of 60 days.
Play for a total of 100 days.