Youtube.com has launched its official National Treasure: Book of Secrets channel, which is offering a video puzzle for viewers to figure out.

The channel has new clips, featured interviews, and a secret hidden video that you must discover for yourself. To unlock the secrets,

In this follow up to the box-office hit National Treasure, treasure hunter Ben Gates (Nicolas Cage) once again sets out on an exhilarating, action-packed new global quest to unearth hidden history and treasures.

When a missing page from the diary of John Wilkes Booth surfaces, Ben's great-great grandfather is suddenly implicated as a key conspirator in Abraham Lincoln's death. Determined to prove his ancestor's innocence, Ben follows an international chain of clues that takes him on a chase from Paris to London and ultimately back to America. This journey leads Ben and his crew not only to surprising revelations - but to the trail of the world's most treasured secrets.

Produced by Jerry Bruckheimer and Jon Turteltaub and directed by Turteltaub, the story reunites the original cast including Diane Kruger, Justin Bartha and Academy Award winner Jon Voight, joined this time by four-time Academy Award nominee Ed Harris, Academy Award nominee Harvey Keitel, and 2006 Academy Award winner Helen Mirren.

National Treasure: Book of Secrets opens on December 21st, 2007.