This is a game my students love, they get to throw things in class! :) Starting with the main screen (shown in the top half of the preview picture) students toss a koosh ball at the SMART Board. If they hit a circle (which is pretty hard not to do on this file) the page changes to a single circle with an addition problem. (as seen in the lower half of the preview image) Students solve, then touch the circle to see if they are correct. After the answer is shown they touch again to go back to the main screen. The image does not show the entire screen, just a portion of it. There are a little over 60 problems total. If you don't want your students to throw a koosh ball at the screen (i.e. you can't trust them to be gentle!) this can also be fun addition practice by just touching a circle.