Makedo

Makedo is the most open-ended toy construction system ever because the reusable tools work with cardboard; a universally available, free and unlimited building block.

Makedo needs little introduction; find some cardboard, grab some Makedo tools and get started. The awesomeness of Makedo is that children learn by doing, creating, experimenting, failing and maybe succeeding but that's not essential. The creations then open the door to imaginative play where the child is the protagonist in a hack-able world of their own making.