The Call of Duty series is considered one of the best war series in the world, but unfortunately the series descended after the release of Code Ghost to Code Advanced Warfare. The question is, how did Cod manage to come back to life thanks to Black Ops 3? But the game did not succeed impressively thanks to the story phase or the cooperative phase, but thanks to the zombie phase.
Three points made the Black Ops 3 Zombies code a beautiful and unforgettable experience and one of the best stages of zombies in the series, and the new things it presented in the series made it one of the best parts for me and for many people.
1- The successful start
The game was released with two of the best zombie stages, namely  
1- Shadow of Evil
2- The Giant
Each stage has a different flavor from the other. You have the stage of the shadow of evil that talks about the world of catholo, strange beings and sacrifices, and on the other hand, you have the giant stage that gives the classic zombie atmosphere that we got used to before in the previous parts. Of course, the game did not depend on the beginning only, but even in the stages of addition, each of these stages is significantly different from the other and gives a beautiful experience.
There are many interesting new additions that we will look at that were released in the Shadow of Evil phase.
1- Superpower
A power that you can get by solving a puzzle or extracting it from the lucky box, and you can use it by charging it by killing zombies, then it gives you a mighty power that makes you destroy all zombies.
2- shields 
A shield that you can obtain by searching for three pieces distributed in the stage. Its purpose is simply to protect you from zombie strikes from behind. You can use the ability of the shield, which has a limit of use three times, and its goal is to kill zombies and get out of narrow places.
3- Chiefs
The emergence of a leader after a few rounds, which increases the challenge and readiness before confronting him, and each leader has different abilities and weaknesses, which makes each leader different from the other and increases the life of the game.
4- Chewing gum
5-Raise the level
6- Variation of stage atmospheres