Although the conspiracy is fewer than the bearded monkeys, Hosojima Hasegawa's song was a masterpiece of open world mechanics.
In the twin deserts of Afghanistan and Angola, your character, Big Boss, is a range of goals to achieve. He traverses the area from walking, riding or various ground vehicles. Fatal or non-fatal weapons and a variety of strange AI companions can be used.
The world itself is clearly desolate, weather is poor and heavily protected. Uniquely, it learns from your actions – you overuse certain tactics, and your enemies adapt. For example, if you use too much headshots, you will wear a metal helmet.
You can build a new facility far from the front line and develop a Big Boss base by flying the enemy soldiers, prisoners, resources, vehicles and animals in the air. And everything you want on the battlefield.