
http://www.youtube.com/watch?v=w-vYBX8cngs
[Front-paged by stabguy]
This video demonstrates a superfast blitz on Maria in memory block six Jerusalem. When you get within the area for the scene you are unable to do any high profile actions. Jump from the fence to the railing which leads you to where you can get in the huddle of the scene. Just go along the railing until you cannot move further because of an invisible wall. To get past the barrier drop down and hang from the side of the railing. Then move further, climb up and drop off the railing past the invisible barrier. You are now in the scene. For the blitz just stand behind Maria and start tapping the
button while the scene ends (remember to equip the hidden blade before starting the scene).
Blitzes: For the first blitz the camera view changes in .07 seconds, but Altair is just standing there. The kill animation starts in .14 seconds. For the second blitz the camera view also changes in .07 seconds, but I'm not sure if that's when the kill animation starts (also Altair's health bar appears a frame before the white flash). So I'm not really sure what the correct times are.

Assassins are forbidden from using weapons inside their fortress with the exception of the training circle. The third tenet of the creed is to protect the Brotherhood, so Altaïr is not allowed into the fortress when Exposed or Unseen. Unless...

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This is a collection of previously unpublished comedy bits:

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Collection of Assassin's Creed cheats and shortcuts.

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The Turkey Shoot: The goal in these assassinations is to immobilize the target so that you can easily stab him/her with the hidden blade. Of course, the developers never intended such assassinations to be possible, so you have to rely on several exploits in order to pull off these types of assassinations.
Here are video walkthroughs for the assassinations shown in "The Turkey Shoot".

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Version 2.0 contains updated blitzes of Tamir, Abu'l, Majd, Jubair, Maria, Robert and Al Mualim.
Blitz assassinations of all the main targets. The concept of this style is to assassinate as quickly as possible, while remaining Anonymous before the kill on certain targets: Tamir, Garnier de Naplouse, Abu'l Nuqoud, Majd Addin, William de Montferrat, Jubair Al Hakim and Sibrand.

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Step by step instructions on how to assassinate Robert de Sable very quickly:
You only get one shot at this per Memory Block playthrough. If you die and reload, Robert is already safely behind the blue memory wall.

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The worst glitch in Assassin's Creed.
Description: Exit the game at the end of Memory Block 6. When you restart, you will be alone and stuck in Arsuf with no way to advance.

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This video begins by demonstrating a cheat: You can make Informers shut up (both before and after the mission) by dropping onto them or by jumping into them and pulling Left Trigger while in mid-air. The same tricks work on Saved Citizens.
After the blitz assassination mission (42.84 seconds), the Informer tells Altaïr about a certain set of Scholars who aren't all they're cracked up to be. The Prima Guide shows a Save Citizen at the Scholars' location on one map, but not others. I believe it's an oversight in the game design.