22 Contestants take it in turn (one per episode) to play for up to £250,000. Each of the contestants picks a box before the show starts. When the show begins, whoever is chosen to play opens random boxes that contain certain amounts of money ranging from a penny to the top prize of £250,000. Whatever amount is revealed is then taken off the game board. At regular intervals, the banker phones the contestant and offers to buy the box for a certain amount of money. The offers from the banker depend on how much money is left on the game board. The banker phones after the fifth box is opened and every third box thereafter. If the contestant does not deal at any time then he or she has to open the box that the banker was attempting to buy, and whatever is in the box is what the contestant takes home.