This is one of a series called “30 Days of Video Games“, an exercise on daily writing.
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There really is only one answer here; Shigeru Miyamoto of Nintendo. His contributions to gaming are legion, including some of the most critically acclaimed and universally beloved games. Super Mario Bros, The Legend of Zelda, Donkey Kong 3… along with those respective franchises, the Star Fox franchise, hell, even Wii Fit1goddamned animated fit board aside. He simply is the Greatest of All Time.
That being said, there are plenty of great designers that belong in the pantheon alongside Miyamoto: Sid Meier, Will Wright and Richard Garriott are among many others. But leading that pantheon is by far, Miyamoto.