Sure, you tell your kids not to play with their food, but the new Smash Your Food app (free) lets them do it in a clean and educational way! Kids use the app to pick junk food out of a fridge and then guess how much "unhealthy stuff" — sugar, oil, etc. — are in each item. After they guess, the food is smashed and they can see how accurate their guess was. The app also includes healthy eating challenges to keep the education going in the real world, too.
Smash Your Food