The «World Seed» (世界の種子, Sekai no Shushi?), is an item that holds a program package called «The Seed» (ザ・シード, Za Shīdo?). The Seed is a free, preset series of program packages that can be used for creating Virtual Reality (VR) worlds as well as control the input and output of the five senses of the players, allowing players to FullDive into the created world. The Seed was created by Kayaba Akihiko and replaced usual proprietary game systems, like the Cardinal System that Akihiko had developed while working for Argus and which was required to run VR games, but had a terrifyingly huge license fee.