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LEGO 21331 Sonic the Hedgehog - Green Hill Zone was a 1,125 piece Ideas set with 1 minifig released in 2022. The set was original designed by UK based LEGO superfan Viv Grannell. After the set reached 10,000 votes through the Ideas program, Lego conducted an official review of the project in March 2020, and in February 2021, greenlit the proposal for development into a real set. LEGO designer Sam Johnson was responsible for turning Grannell’s concept into a proper set.

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