"Metal Gear Solid 5: The Phantom Pain" has been holding a secret, and Konami is feeling generous to let its fan know how to unlock it.

According to PC Gamer, the nuclear disarmament is "Metal Gear Solid 5: The Phantom Pain's" most intriguing secret, and fans who have been playing the game have not yet discovered how to unlock it. Well, good news, Konami has finally unveiled the guide on how to get to it. The challenge called The Secret Nuclear Disarmament Event requires four steps before you can unlock it and it includes completing Mission 31 as the first step.

The second revelation states that a player must not be currently working on a nuclear weapon. In case he has already developed one, he must immediately dismantle it in order to proceed. The third one relies mostly on your platform's regional server and this includes PlayStation 4, PlayStation 3, Xbox One, Xbox 360 and PC. The last one requires regional servers to make sure players have zero nuclear weapons on their game in order to unlock it.

Konami's reveal also came with a note that says, "If all four conditions are met, you will automatically trigger the secret nuclear disarmament event when you return to Mother Base of after you complete a main mission."

In the event that new nukes will be introduced in the game and provided the player has met conditions three and four, the player should repeat the four step guide in order to acquire the new nukes. According to PCGamer, Konami has been tracking the worldwide number of nuclear weapons acquired worldwide, and since the revelation, these numbers have dropped to a significant number. This means that players are seriously considering unlocking The Secret Nuclear Disarmament Event.

Meanwhile, PiggyBack featured the "Metal Gear Solid 5: The Phantom Pain" exclusive art book, which contains a 48-page art gallery all in full color. It has a limited print run that will only be available during the launch and will also contain comprehensive maps that show where everything can be found.

The Collector's Edition Art Book is stitch-bind and has a dimension of 210 millimeters x 280 millimeters. It's printed on high-quality paper and bound on a premium hardcover.

"Metal Gear Solid 5: Phantom Pain" is Hideo Kojima's last project with Konami.

Have you unlocked The Secret Nuclear Disarmament Event? What nuclear weapon did you give up in order to proceed with the unlocking guidelines?