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LEGO Ideas 21331 Sonic the Hedgehog - Green Hill Zone: The perfect set for a speed build [Review] - The Brothers Brick | The Brothers Brick
LEGO® Ideas review: 21331 Sonic the Hedgehog™ Green Hill Zone | New Elementary: LEGO® parts, sets and techniques
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BrickLink - Minifigure dim031 : LEGO Sonic the Hedgehog [Dimensions:Sonic the Hedgehog] - BrickLink Reference Catalog
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