You can earn up to three stars per level. They are awarded based on your points scored. Get headshots on zombies, hit bulls-eyes on targets, and shoot other objects such as ducks and buckets to get more points. A combination of headshots, bulls-eyes, and combo shots will result in more points. String together shots at zombies and targets as collectively as possible while keeping the meter running between reloads.
To get unlimited stamina, advance the time on your device. Remember to change it to the correct time afterwards. Stamina is required to enter the next level. When your stamina runs out you must wait until it refills or pay five gold. Connect to Facebook to get a one-time stamina boost.
Use the zoom in features of your weapons to earn extra points. Learn the movement of the screen when you zoom in and try to shoot accurately without waiting for the full zoom. The faster you can shoot a perfect shot, the better. Prioritize the faster or closest zombies that can harm you. Also eliminate projectiles as soon as possible. Then, target slower enemies and those that are farther away.
When upgrading your weapons you can improve the following categories:
Body: Increase damage and range.
Clip: Faster reload speed and bigger clip size.
Sights: Allows you to zoom in and get accurate shots.
Because of the cost of upgrading, it is best to choose one weapon and maximize all of its upgrades. Start by upgrading Sights first, then make Clip the next priority. Save Body upgrades for last. By following that order you can get the best performance as early possible. However, do not maximize one type of upgrade and totally ignore the other two. Make sure you allow the other upgrades to progress if the weapon's performance is beginning to suffer.
Each weapon has its strengths and weaknesses. You can upgrade these weapons by increasing damage, clip size and body, accuracy, and durability.
Machine gun: Large capacity, but weaker bullets. Best used when many targets are available.
Pistol: Good accuracy, but weaker bullets. Recommended weapon for distant targets.
Shotgun: Powerful, but slow to fire. Wide damage area that works well with clusters of zombies.
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