After playing the game for at least one week, complete the indicated task to have Tom Nook's store upgraded to the corresponding level.

Nook N' Go: Spend or sell 25,000 Bells at Nook's Cranny and wait one week from the day Nook's Cranny first began.

Nookway: Spend or sell 90,000 Bells at Nook N' Go and wait two weeks from the day Nook N' Go first began.

Nookingtons: Spend or sell 250,000 bells and wait three weeks from the day Nookway first began. Note: Unlike Animal Crossing or Animal Crossing:Wild World, you do not have to have someone come to your village to buy one thing as well to get Nookington's.