[1] Unlike previous seasons, this year the Sub also aired an interactive text message contest Big Brother Game on weekdays, hosted by three of housemates from the third season Kadi, Farbod and Aki.

However, Big Brother reserves the right to change the rules at any time without notice.

The open auditions for the season were completed in April 2008 in Helsinki, Oulu, Rovaniemi, Jyväskylä, Tampere and Turku.

In addition, based on audition videos published on the Internet community, the public could choose their own favorite as a housemates.

[2] A number of contestants (known as "housemates") live in a purpose-built house in Espoo, and are isolated from the rest of the world.