Hideo Kojima was taken around PlayStation Studios by Mark Cerny and Sony to help him find an engine to make the original Death Stranding. 

He eventually decided to work with Guerilla Games on the Decima engine and Hermen Hulst offered Kojima the source code and the results look stunning to this day!

'You know what, let's just give Kojima Productions our source code on a stick and offer it to them,'"

"They just couldn't believe that a studio like us would just hand that to them. They wondered why. The honest reason was just for them to make a game. The idea that we can enable a studio of that calibre to make a great game, and we can play a part of that," - Hermen Hulst