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Sega published its annual report yesterday, which says that the Sonic The Hedgehog franchise has moved 1.6 billion units as of March 2023.
The figure, which includes both its full game sales and downloads of its free-to-play versions, is up 7% compared to last year.
source https://www.gamesindustry.biz/sonic-the-hedgehog-franchise-moved-16bn-units