6 Galaxy Nintendo 3DS XL ($517) This console is a really unique one because it's a limited edition console that has gotten pretty rare and expensive, but doesn't actually feature any iconic characters or games like others do. To pick up one of these consoles, you'll have to pay around $517.

1 Barbie: Groom And Glam Pups Weirdly, the rarest 3DS game is fairly cheap on the DS, but the 3DS version had a much more limited run, resulting in its heavily inflated price. Even just for the cartridge, it's over $700, which shows how difficult it is to get your hands on a copy of this game.

Nintendo's focus is now fully on the Switch, of course, with the console's hybrid nature removing the need for a dedicated handheld system. The company has shipped more than 61 million Switch consoles as of the end of June — a figure that is likely to overtake the 3DS this holiday season.

"This can be a problem when viewing 3D if you have a weaker eye. If a child spends excessive time using a device such as the 3DS, it could effectively act as a negative exercise, as opposed to strengthening the eye, and it can leave it underdeveloped, causing a 'lazy eye'."