A game or software file can only hold so much information. Even if its randomly generated like minecraft and not preloaded, overtime theres so much information, whether it be physical aspects of a game or code that moves you away from the center in the first place, every unit youve made it away from the center adds up and it gets overwhelmed and cant proscess and generate the new information
Metaphorically speaking the more miles you walk outwards the more miles the computer has to process, and eventually it gets overloaded with too many
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