With the latest update, it's a good time to enable Parental Lock on your 3DS, because if you do: 1) Nobody will be able to format your 3DS without the pin 2) Nobody will be able to delete your NNID from existence without the pin (= all your eShop purchases LOST, both on 3DS and Wii U) 3) You can lock the Miiverse (mostly useless if you're over 10 and slow anyway) so nobody will be able to draw a penis from your account granting you a NNID ban (= all your eShop purchases LOST, both on 3DS and Wii U) It takes a prank to lose tens/hundreds $$$ worth of eShop purchases. Or maybe your 3DS get stolen and the thief "draws penises" on the Miiverse --> your NNID gets banned --> you ALSO lose your Wii U purchases. If you're paranoid you might also wanna restrict web based Miiverse access from PC/smartphone devices (there's an option for that), should anybody steal your credentials and make ban-worthy abuses on the Miiverse through web access. That's the dark side of having NNID/Miiverse on the 3DS. Take adequate preacutions. The sad thing is we're still far from peace of mind when investing in eShop digital games. Years worth of purchases can disappear in the blink of an eye.