Several emulators support this game depending on your platform:
How To Play Tomodachi Life: Living The Dream on PC [Ryujinx]
To play for free on an emulator, you can use popular tools like Citra or its modern forks like Lime3DS on Windows, Linux, and Android. While Citra development officially stopped in 2024, it remains a common choice for running 3DS games on PC. Emulators for Tomodachi Life
Both Citra and Lime3DS have Android versions available.