Amazon.com: JIXIn Building Kits Compatible with LEGO DUPLO/Crossbow/Plane/Robot Dynamic Gear Building Toy Set for Preschool Kids/Erector Set 218 PCS Classic Big Blocks STEM Toys/Gift Toy for Kids Age 3 4 5 6
LEGO compatibility with Duplo, Quatro, and even bigger LEGO bricks - YouTube
Blue 2-Sided Baseplates by Nilo Compatible with Lego & Duplo Blocks
Amazon.com: JIXIn Marble Run Building Blocks Compatible with LEGO DUPLO/3-IN-1 Multiplayer/Gear Handle Fun Marble Maze Blocks Building Toy Set/164 PCS Classic Bricks/Gift Kids Toys for Boys/Girls Age 3 4 5 6 7
Mind blown. 30 years with Lego and I just realized duplo are compatible. : r/lego