Knutson-Tao puzzles are large triangles with the sides labelled by strings of $0$s and $1$s which are then filled in with small triangles and rhombi. We will show that one can use the filling in of the puzzles to define the multiplication in a (commutative, associative) ring. We will then talk a bit about the Grassmannian and how it's related to the puzzles, which tells one can use geometry to understand more about the puzzles.