These range from simple "pocket pets" style digital games that fit on a keychain to full-size gaming systems installed in your vehicle. In between, you have handheld electronic games, dedicated gaming devices and games that can be played on cell phones. While video games may not be the most creative thing children can be doing, they're at least interactive. Perhaps more importantly, any mayhem is confined to the small screen rather than the back seat of your car [source: CNET].
However, you don't necessarily have to lug around portable electronics, movie cases and an assortment of new batteries when you hit the road. For some ideas on free in-car entertainment, go to the next page.