Metal Gear Solid 4 is a ridiculously good game.
Even by itself, it’s an awesome experience just previously unseen in video games. Global conflict has become the sole economic pillar. You play as Old Snake, a grizzled battlefield veteran with one final mission: assassinate the leader of the world’s private military corporations (i.e., mercenaries), who happens to be your genetic twin brother. Nuclear deterrence, nano-machines technology, genetic manipulation, and world superpower conspiracies, they all weave into an alternate universe with events drawn from the annals of modern history.
Forget the princess in the other castle.