Fans who are clamoring on what the Zombies Mode of "Call of Duty: Black Ops III" is all about, a new trailer will shed light on how the four main characters unraveled their origins and how they even became fighters of zombies.

According to GameSpot, the trailer did not disappoint. A quick view on the main characters, played by Ron Perlman, Jeff Goldblum, Heather Graham and Neal McDonough, shows how their history of murdering and killing people turned them into something deeper and darker under the influence of the Shadowy Evil. The trailer shows a rather gloomy city where the characters go about their killing sprees.

Meanwhile, the "Call of Duty: Black Ops III" recently revealed the estimated time to play the single player. According to Attack of the Fan Boy, it may rack up from 14 to 15 hours of playtime just for the single player.

Treyarch also revealed that among the "Call of Duty" series, the "Black Ops III" is, by far, the longest yet. In fact, former versions of the game didn't even last half way through the "Black Ops III" single player game time and have lasted for almost six hours only.

The game also doesn't restrict a player on missions they need to play. In fact, a player can take on the last mission first before heading to the rest of it. One factor to remember though is that you can only see the games ending after you have played and conquered all the missions.

Eurogamer confirmed this by reporting that all missions are unlocked from the start of the game. In a statement given by Jason Blundell of Treyarch, he said, "It gives them flexibility to consume the content how they want. The unlocking level system is an archaic mentality we've had since we did bedroom development back in the day - you do this, then go on to the next one."

The downside of being able to jump at the last mission is that players will spoil themselves of the game's interesting feat. They might be also prone to spread information about the missions to those who wish to tackle the game's missions from the start all the way to the end.

Either way, the most important thing is that players would like to know how the game will end, and regardless on where they start, they still need to complete all the missions to get to the end of the game.