The purpose behind the Fox Engine, he writes (as translated by Kotaku), is to create photo-realism within game worlds. In a series of tweets, he explained that beyond the necessity of online connectivity in modern games, visual realism is also required:
"The age of fixating on pictures and sound in games is over. Now the questions are: How free is it? Does it connect to the internet and is the gameplay smooth? Even so, a certain level of realistic atmosphere is required."
"At Kojima Productions we're aiming for a line where even simple CG models look photo-realistic when you zoom out of the game screen."
Kojima gives an account of the release of the original Metal Gear Solid in 1998, stating it represented the end of pre-rendered movies.
"We looked to the future and chose to have video sequences in the game that used polygon models instead of pre-rendered graphics. Now they make VFX movies with game engines," he writes, adding "With Peace Walker, we tried a hand-held system with the age of cloud technology in mind. People laughed at us then, too."
Developers and games creators must continue looking to the future when designing new titles, he says. Capitalist incentives are not the answer; technology is.
"Businessmen in the field always think ‘What platform or career is going to succeed? With whom/where should I strengthen my ties?' and look to the future and choose their path from there. But technology is always evolving, and it always leaves the laboratory and becomes a part of everyday life. Creators must look to that future when they create."