the first puzzles are "the codebreakers". these consist of three wheels, one relating to each episode. each codebreaker has six different questions and challenges relating to it, the answers to which surround the wheel. answers to these questions can be found by watching the episode for clues, completing a flash game, solving a puzzle on the programme's blog or reaching a milestone in a mass community challenge, which involves trying to find examples of all the prime numbers between 2 and 2011 in the real world. once a clue is found, the challenger can enter it into the codebreaker by moving the correct "hand" around the codebreaker. each time a hand is moved, the password given changes. each possible outcome of the codebreaker produces a different password to the ultimate challenge. entering the correct solutions into each of the three codebreakers will result in the challenger getting the three correct passwords. once these are entered, the ultimate challenge is accessible.