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Well, at least for me. I remember being in elementary school...can't recall which grade - maybe third...maybe sixth (sometime around 1980 - I think). Anyway, my aunt had a boyfriend that worked with computers somewhere. In 1980-ish, that rather impressed me. Somehow, it came up in conversation that he and his colleagues spent some time playing a text-based adventure game on the computer. He had my attention. He also offered to "run me through" the game - without a computer - just me and him, sitting in the living room of my grandparents' house, talking. He would act the part of the program, from memory, and I would speak my input commands.
It was my first RPG experience. There were no character sheets. No dice. No books. Just me exploring a fantasy setting with a "Dungeon Master." I don't know why this guy put up with me for so long while playing this game, but I will always be grateful. I remember the forest, the building, the lantern, the maze of twisty little passages.
While I would jump headlong into D&D soon after, at that point I'd never heard of the game. I just knew I was hooked on "Adventure" - as the boyfriend called it. And it was. CCA and Zork both influenced my gaming style and content for the first few years, and the early versions of the D&D rules tended to support this style for me.
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Sometimes, I think I might have created my own version of D&D if others hadn't. All the pieces were there for me. And, all the drive to do so. I even delved a little into "miniature combat" with the game of Feudal my father gave me. I never played it with anyone, or by the rules, but spent hours in my own tiny medieval realm with my tiny plastic medieval armies and castles.