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.

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

ITEMS

Sparklers
Talk to Tortimer during the Fireworks Show. 

Tom Nook's picture
Put enough money in your account at the town hall so that you are sent a safe. Carry your safe in your pocket and go to Tom Nook's store. Talk to him. He will ask for the safe. Give him the safe and he will give you a glamour shot (which is a picture of Tom Nook)

Red weed
Get the maximum number of weeds possible in your town. A large red flower-like weed will appear. It can only be removed after all the normal weeds are gone. 

Deliveries
When animals ask you to deliver things, if it is a letter or a package go to your pockets and select it. An "Open It?" option will appear. If you choose that option, you can open the item. Note : If you open a package and talk to the animal that you are delivering it for, they will get very angry. 

Free furniture
Sometimes when you go to the Town Hall, the recycling box may have furniture that you need. The lost and found at the Main Gate also may have free items. Talk to Booker, the dog on the left, to get to the lost and found.

Here's a video of this popular game: