"There are a lot of terrible educational games out there, where you have to do something unfun, like solve five math problems, so you can do something fun, like play a game," said Ben Stokes, a games expert at the MacArthur Foundation.<br><br> Instead, the experts are interested in the educational benefits of commercially available games that were not expressly designed for school use--simulation games like Zoo Tycoon, in which elementary school-age children can build virtual zoos by selecting animals, creating appropriate habitats, managing food budgets and even setting the prices of popcorn at the concession stands.<br>