Matrix Multiplication
The UI confuses me to the point of frustration.1. A "Previous" button would help since otherwise you have to go loop through the whole thing to see what actually happened (e.g. how exactly the first step lifts and rotates the matrix, what's getting added to what).2. The final animation step is a transition from the patently false equation "[matrix1]=[result_matrix]" to the finally correct equation "[matrix1] x [matrix2] = [result_matrix]". This could be avoided if instead of transforming "[matrix1] x [matrix2]" into "[matrix1 plus overlay]=[result_matrix to be filled]" and then doing the 'waterfall', the equation "[matrix1] x [matrix2] = [result_matrix to be filled]" was maintained throughout, perhaps with the moving overlay slightly grayer after lifting [matrix2].