How do I restart a game?

I've created a kids addition game (modified from a tutorial) and I can't seem to get it to 'play again'. It will default all the elements to their 'design' values.

Any ideas to steer me to the correct way of making it work? I know it must be something simple, but I can't figure it out

Thanks.

dropbox.com/s/zan65s5odfe1ztm/additionGame.capx

You forgot to re-activate your Functions group on restarting, maybe some other groups too.

Thanks, dop2000. That did the trick!