If I recall correctly, this game is about the building of Outer Heaven, the first one. They probably took out the number because the main Metal Gear Solid series was about the Patriots and Les Enfant Terribles. Where as this one is just expanding on what happened before the original Metal Gear game.John Funk said:Now, the question becomes: Why was the title changed? If Peace Walker is an "MGS5-class game," why isn't it Metal Gear Solid 5 anymore?