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

CHARACTERS

Blathers: Become friends
Talk to Blathers when he looks sad to find out that he does not like bugs. Keep talking to him on consecutive days until he is done talking about his phobia. 

Brewster: Become friends
Talk to the coffee selling animal and buy a coffee from him every day. He will start becoming friends with you.

If you befriend Brewster by buying coffee every day, in about two to seven weeks he will ask if you want pigeon milk in your blend. He will begin to change the blend a little bit more each day.

Crazy Redd: Entering his tent
To enter Crazy Redd's tent you must give a password the first time and become a member. You can usually find the password by talking to some of the villagers.

Here's a video of this popular game: