Rigamajig is much larger, and has many more parts to share. It’s intended for 2-20 kids to play together in a supervised environment. Teachers across the US have been developing lesson plans that use Rigamajig to learn simple machines, mathematics, STEAM topics, and much much more. Best yet, the students design ways to use it in the classroom and all around the school.
Rigamajig Jr.is great for 1-4 kids to play with. It requires less open space, and stores away in it's own gym-bag sized duffel.