Some observers date the history of “proto-Metaverses” to the 1950s during the rise of mainframe computers, which represented the first time that individuals could share purely digital messages with one another across a network of different devices. Most, however, start in the 1970s with text-based virtual worlds known as Multi-User Dungeons. MUDs were effectively a software-based version of the role-playing game Dungeons & Dragons. Using text-based commands that resembled human languages, players could interact with one another, explore a fictional world populated by non-playable characters
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