Thank you teachers! Mark the children's work (red for try again and green for correct) at their feet with the marking pencil as work comes in thick and fast from Seesaw. If you get it wrong or let a pupil get to the bottom you lose one of 5 lives. If you get it right you get a point. They get faster!
Thanks to my family who helped brainstorm ideas and for testing, and to my cats who helped me when I was a bit stressed.