Nintendo utilizes region lock, where you can not run software developed in different regions than the region your system was developed for, so for example you can't run software manufactured in Europe on a system manufactured in the US. Although Nintendo has not implemented this technology in their most recent Nintendo Switch, all other Nintendo systems as far back as the NES/Famicom apart from the Nintendo DS/Lite/DSi/DSi XL contain region-lock, which is...bullsh*t.

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