My 5 yo son asked to play one of his favorite games (I loved this game when I was a little girl). However, we have to be flexible with the rules when you play with my 2 yo son. "What rules?," I say, "I didn't know Hungry Hippos had any rules. Don't you just smack the button until the Hippos are all satisfied?" If you look closely at the photo, my 2 yo is opening the hippo's mouth and shoving the marbles in. Notice also that his Hippo has the most marbles.