Animal Crossing: Wild World features a very minimal plot. The objective of the game is to pay off a debt to Tom Nook, who allows the player to move into a house he owns. If the mortgage is paid off, the player's house will expand until upstairs, left, right, center and back rooms are included. This is slightly different to the Nintendo GameCube version, in which the finished house only consisted of a basement, a main room and an attic. While paying off a debt, the player can do a variety of optional tasks, including interacting with other villagers and filling the catalog of the things you have, like furniture, fish, clothes and stationary. 

Animal Crossing: Wild World makes use of several of the Nintendo DS' features, including the touch screen, dual screens and internal clock. The touch screen is used for menu navigation and interacting with the surrounding area, including movement, using tools, talking to other villagers, entering buildings, picking up items, etc. The dual screens are used to display the overworld on the touch screen and the sky on the top screen, which varies depending on the circumstances. 

HINTS

MONEY

Interest from bank

Go to the bank and access your account. Save all the money you have into the account. Save the game and turn off the DS. Change the date to ten years later and your money will go up, depending on how much is in there. It usually goes up 99,999 Bells.

Insert any amount of money into your savings account. Once there are about 50,000 Bells in your account, save the game and turn off the Nintendo DS. Go to the DS time settings (the system settings, not the Animal Crossing settings). Change the date to the year 2099. When you resume the game as the same character, you will receive a letter from the Post Office stating that you have 99,999 Bells (possibly less). This money has already been added to your savings account. Note: You will get many weeds from doing this, but if you do it more than once, pick your weeds when you are done, as they return quickly.

Here's a video of this popular game: