: Standard 3DS systems are region-locked. However, flashcards like Gateway (in Gateway Mode) or a modded 3DS running Luma3DS can bypass these locks to play out-of-region ROMs.
: Access the Gateway menu by holding L while launching the exploit. Select "Format EmuNAND" to create a hidden partition on your 3DS SD card for updated firmware. Sonic Lost World 3DS ROM (EUR/USA) (Gateway/Sky...
: This newer version supports direct drag-and-drop. Format your microSD to FAT32 and copy the .3ds ROM file directly to the root. : Standard 3DS systems are region-locked
: Launch Gateway mode from the system menu. Once in, press Select to bring up the game selection menu. Sonic Lost World 3DS ROM (EUR/USA) (Gateway/Sky...
: Use the D-pad to highlight Sonic Lost World and press A to mount it as a virtual cartridge. Sky3DS / Sky3DS+