are duplo and lego compatible?
﻿﻿DUPLO® and LEGO® bricks are compatible, so you can use them together. There are some limitations, however. DUPLO® bricks fit best on larger LEGO® bricks and may come off easily from smaller LEGO® parts. ... LEGO® bricks will fit on DUPLO® parts as long as the DUPLO® ones have hollow studs on top.