Here’s a quick breakdown of — what it is, where to get it, and how to use it legally and safely. 1. What is Snes9x for 3DS? Snes9x for 3DS is a Super Nintendo (SNES) emulator for the Nintendo 3DS family of consoles (Old 3DS, New 3DS, 2DS, New 2DS XL). It runs SNES game ROMs.