Week one tested your powers of memory and recall, while last week's challenge tested your research and deduction abilities (and if you're still struggling with it, don't worry help is at hand here).
But strand three is a very different beast, designed to test your artefact analysis, cipher enumeration and pattern recognition skills in one of the most devious challenges yet. We know it's tough, but it's designed that way, so stick with it...
For know oh heir of Altair that if you are victorious in each of the five puzzles and then the final Unlock the Animus challenge, you will receive a fantastic trip to Istanbul for yourself and a friend, including flights, four nights of hotel accommodation and £500 spending money and a chance to tour the beautiful and historic Constantinople of the Roman, Byzantine and Ottoman periods.
We've also got a bunch of exclusives for Assassin's fans on the site including today's Q&A the Assassin's Creed team, including art director, Raphael Lacoste, creative director Alexandre Amancio and scriptwriter Darby McDevitt, where they discuss building the ancient city of Constantinople plus the various hidden locations you'll discover in the game. The Q&A may even provide some subtle clues to this week's puzzle.
You might also check out our highly popular Assassin's Creed: Revelations preview for the latest gameplay details, including hot hook blade action and assassins' den tower defence.
But if you can't wait to see this week's challenge head straight on over to Unlock the Animus right now for full details, competition rules and to attempt the third strand - do let us know how you've got on.