I should outline the possibilities: legal access through online stores if possible, the process of extracting a ROM (with the legal caveats), and alternative methods like emulators with a backup of their own game. Also, maybe mention that some games are available on the eShop or other platforms now if they're interested in playing legally.
Another angle is that maybe they're not familiar with the correct title. "Lemur" was a 3DS game published by Nintendo as a Virtual Console title. So they might be looking for the ROM of that specific title, which would require specific tools or methods. Since 3DS games aren't easily emulated on other platforms, the user might need an emulator like Citra that supports 3DS games, but the ROM must be legally obtained. lemuroid 3ds roms
Also, possible confusion with other games. Are there other "Lemur" games? Probably not. The main one is the 3DS Virtual Console title. So I need to be specific about that. I should outline the possibilities: legal access through