Harry Potter: Quidditch World Cup is a video game produced by EA Games that features the fictional sport of Quidditch from the Harry Potter universe. The user plays for the Hogwarts Quidditch Cup (competing between Gryffindor, Slytherin, Hufflepuff and Ravenclaw) and then takes on the Quidditch World Cup (competing between the United States, England, France, Germany, Scandinavia, Japan, Spain, Australia and Bulgaria.) Its teams have drawn criticism mainly for the lack of the Irish team, which won against Bulgaria in the World Cup in the fourth book.

Because the books have not named all of the members of the Hogwarts house teams, the video game has filled in the gaps as follows, around Harry's 3rd year. Though these names are not considered canon, it is possible that J.K.Rowling provided them, as she has been known to participate in multimedia projects, such as the Harry Potter Trading Card Game. Here's a list of the stadiums and other stuff you can unlock while playing the game:

Unlockables

Unlocking new Stadiums
Simply win the noted game to unlock the stadium.

American Stadium - Win 6th World Cup Match (Nimbus 2001 Difficulty)

Australian Stadium - Win 6th World Cup Match (Nimbus 2001 Difficulty)

Bulgarian Stadium - Win 7th World Cup Match (Nimbus 2001 Difficulty)

English Stadium - Win 1st World Cup Match (Nimbus 2001 Difficulty)

French Stadium - Win 5th World Cup Match (Nimbus 2001 Difficulty)

German Stadium - Win 3rd World Cup Match (Nimbus 2001 Difficulty)

Hogwarts - Summer - Complete Tackling Challenge

Hogwarts - Winter - Win Hogwarts Cup

Japanese Stadium - Win 2nd World Cup Match (Nimbus 2001 Difficulty)

Spanish Stadium - Win 4th World Cup Match (Nimbus 2001 Difficulty)

The Nordic Team Stadium - Win 7th World Cup Match (Nimbus 2000 Difficulty)

Here's a YouTube video showing some gameplay footage that most gamers consider to be extremely poor. Well, the graphics are really poor: