The DS line of Nintendo handhelds is a monster. Not only is it the best-selling handheld gaming system of all time, it's the second-best-selling video game system period of all time. Only the PlayStation 2 beats it in terms of numbers moved. The amount of power that developers manage to get out of cartridge technology is amazing, and great titles continue to be released exclusively on the system every year.
As popular as it is, though, there are still some hidden mysteries about it. Let's look at a few.