- Cheat Gnome
While on a lot, quickly push B, Z, Up, Down, B to spawn the Cheat Gnome. The Cheat Gnome appears at different locations, depending on which island you are on. Find the Cheat Gnome, then enter one of the following codes to unlock the corresponding option on the Cheat Gnome:

All motives Quickly press Minus, Plus, Z, Z, A.
All plans Quickly press Plus, Plus, Minus, Minus, Z.
All crafting resources Quickly press A, A, Down, Down, A.
Maximum relationships Quickly press Z, Plus, A, B, 2.
Maximum current food and resources Quickly press Left, Right, Left, right, A.
Add one to skill Quickly press 2, Up, Right, Z, Right.

- Bonus outfits
Pause the game and press Z, Z, A, Z, 2 at the 'Fashions And Grooming' screen to unlock a vest for a male and a tank top for a female.