If there’s one thing that has fascinated the Call of Duty players a lot this year, it has to be Warzone 2’s newly introduced setting called DMZ. While it was a mystery in itself, prior to an official announcement, the unconventional mode has definitely made an impression of its own among the fans so far.

Whether it’s about containing various challenges to get lucrative weapons or looting huge amounts of cash, the DMZ mode is an interesting offering inside Warzone 2 from the team of Call of Duty. Recently, it received yet another interesting addition in the form of an abandoned laboratory area called Building 21. However, this location has mostly remained a mysterious puzzle for the players until recently.

Call of Duty Warzone 2: Top tips and tricks to unlock Building 21 Keycards in DMZ

As is already known, Building 21 is a highly classified area in Warzone 2. The “clandestine biological laboratory” is a tough battlefield for the players because it involves a challenging mission to be completed. Being a separate area from the map of Al Mazrah, this laboratory is located somewhere else. Thus, one cannot just easily gain the access to have an entry inside it, unless they have got keycards.

Yes, to enter Building 21, Call of Duty players in DMZ mode will need to have keycards. But they need not worry about how to find them on a large map. There are, in fact, some useful ways to get access to the Keycards in different locations within Al Mazrah.

READ MORE: Call of Duty Warzone 2 – How to Master the Tricky ‘G-Walk’ in Season 1?

The Keycards are randomly distributed across the Al Mazrah region inside Call of Duty Warzone 2. To begin with, Strongholds, Fortresses, and trains may end up being good options in order to carry out a search and find the cards. They will be usually kept inside red and orange loot boxes. These places can prove to be dangerous so players will need to be extra careful while on their quest.

Moving further, random supply drops may also contain the Keycards for Building 21. One can find them with the help of an announcement before they are dropped on the ground in a given area. The next method to get the cards is to find the supply caches shot down by SAM launchers. They may also contain the desired reward.

One more way to get the Keycards is to take down an aggressive helicopter that usually spawns during a given time at any location inside the map of Al Mazrah. To defeat it, Warzone 2 players will need a good amount of impactful ammo and suitable weapons. After accomplishing this task, they can simply loot the remains. If they are lucky enough, they might end up finding a keycard as well.

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