Playing Nintendo 3DS might not be for the youngest people in the audience, CNN reports. According to Nintendo's Japanese website, children under the age of six might hurt their eyes if they play the machine with the 3D-effects turned on. Worried parents can turn the 3D off though, and even password-protect the feature so that nosy kids won't turn it on anyway.
Other technology companies that work with 3D have issued similar warnings, and the Nintendo Virtua Boy (their last attempt at 3D-gaming) came with one as well.