There were other game-like inventions before Tennis for Two, and there's no reason to think it was a profound influence on later game designers. But it might be the first such invention that resembles what we now call video games.
Years later, companies would invoke Higinbotham's invention as "prior art" in commercial lawsuits over video games.
Higinbotham’s deposition from a 1976 court case where lawyers tried to use Tennis for Two to shoot down claims by Magnavox:
https://www.bnl.gov/about/docs/higinbotham_deposition.pdf
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