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Mega blocks, Duplo, and LEGO all fit together despite being completely different sizes : r/mildlyinteresting
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Amazon.com: MEGA BLOKS Fisher-Price Toddler Building Blocks, Green Town Build & Learn Eco House With 88 Pieces, 4 Figures, Kids Age 1+ Years : Toys & Games
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Amazon.com: Brickyard Building Blocks 177 Pieces Large Building Block Toys for Children Ages 1.5-5, Bulk Block Set, Compatible with Duplo (177 pcs) : Everything Else
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Amazon.com: Mega Bloks Peek A Blocks Construction Site, Building Toys for Toddlers for ages 1 years and up (30 Pieces) : Toys & Games
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