What you can do
The demo is best for testing the character creation flow and seeing whether the island-life rhythm fits you before buying.
It is also a low-risk way to start a save because Nintendo says progress can carry over to the full game.
Where to get it
Use official Nintendo and Nintendo eShop channels. This site does not host installers, game files, or unofficial downloads.
FAQ
Is there a free demo?
Yes. Nintendo describes a free demo for Tomodachi Life: Living the Dream.
How many Miis can I create in the demo?
Nintendo says the demo lets players create up to three Mii characters.
Does demo save data transfer?
Yes. Nintendo says demo save data can transfer to the full game after purchase.