Most of the 3DS Roms are for Citra emulators which are 3ds decrypted roms. The Nintendo 3DS was first released in Japan and internationally in March 2011. The 3D Depth Slider allows you to control how much 3D depth you would like to see. Nintendo 3DS provides a new way of playing 3D without the necessity for glasses. It was announced at E3 2010, as the successor to Nintendo DS. Nintendo 3DS is a handheld console for playing games.
3DS Roms are Deprecated game files of the Nintendo 3DS console that you can play on different devices by one of the 3DS Emulators.