[SiMoN!]

Housemates are going to be taking part in a giant board game of Big Brother. And the first to finish will win a very special prize - a ticket to the final week.

Previously, the House has been transformed into a university, a majorettes training ground, a prison and now it's a massive board game. This afternoon, the housemates will become players and wear ridiculous board-game-piece outfits as they move around the board.

The housemates will throw a dice to decide who goes first and from then on in, it's simple. The six housemates will take it in turns to roll the dice and then execute the instruction written on the square that they land on.

Every space on the huge board will be numbered in order of days in the Big Brother House so far - so that's one through to 80. Also, some squares on the board will have 'Diary Room Card' written on them. If a housemate lands on one of those squares, he or she must go and collect a card. The cards have all kinds of silly House-related things written on them, like - 'You swore live on Channel 4, go back three spaces.' Loving your work, Big Brother!

The first housemate to get to day 80 of the board game will win the game and that brilliant prize of a guaranteed place in the final week. Woo!

And the good thing is, the housemates haven't a clue what they're playing for. Game on!