The Hidden Blade Assassin's Creed in Depth

http://www.youtube.com/watch?v=LJ3F75NTmNE
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Note: Aurel found this first and then told me about it, so I didn't really do anything.
You can do this by starting the William assassination at the bureau and then infiltrating the fortress without the scene starting (see this article). At certain points in the fortress, all the soldiers will disappear. You can then setup an 'invisible kill' with air-to-assassinate: you lock onto your target and make sure you jump through one of these spots. Near the back of the group is a great spot.
Altaïr then performs an air-assassination ( ) and the memory corridor scene starts. Afterwards, you can just stroll out of the area and get back to the bureau, after which you will have completed the mission.
I opted to get out of the city instead, to see if the back-to-the-future exploit worked. It didn't, but William's army has become substantially smaller, which makes setting up an anonymous kill very easy with a couple of knives.

http://www.youtube.com/watch?v=s-rL2hsGhRM
---promoted to front page by Ian---

So I went back to find more things in King Richard's Citadel just prior to the scene in memory block four. And I'm glad I did, because I found a much easier way to get in there, as well as some interesting discoveries.

Easy Infiltration

http://www.youtube.com/watch?v=UVi9HFYZSaM
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Finally got around to doing this. The goal is to escape while inside the fortress. This is a pretty robust route, always works for me. There are other hiding spots inside the fortress should anyone else want to try this.

Ian and stabguy pretty much nailed all the stunts for this assassination, so I thought I would take a different approach. Use the priests so you can blend right next to him and assassinate him in front of all his guards.

For those interested I will start working on the save citizen video for this district soon

http://www.youtube.com/watch?v=cQXkZV-bzO4
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A preassassination on William is possible using the same method as the one for the superfast blitz. But this time jump to the other railing (aim your jump by facing the post with the camera and jumping forward), get to the end, jump to the scaffold and grab on (make sure Altair is never in an upright position when you are doing this or you can't do any high profile actions and the scene will start). Then climb to the other scaffold and jump sideways to grab on to a higher part of it. Jump from that to a balcony, then to a beam, then to a plank. You are so high up that the scene won't start. Now you just need to climb inside the fortress where you will meet William and his men (too bad King Richard and the horsemen weren't in there). It gets a little glitchy as you can see with them appearing and disappearing. When you kill William it does the kill animation for targets and afterward you hear the phrase "close the gates", which is a game script for killing William. However there is no scene since William is not identified as a target by the game yet. After the scene it gets more glitched since you can't move through the invisible wall that's still there and you can't do any high profile actions.

http://www.youtube.com/watch?v=X31O38Jpyw0
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A superfast blitz on William is possible because of how the game works. When you get to the assassination jump from a certain spot on a roof to grasp the edge of a railing and pull yourself up. The scene won't start because you're not in an upright position. Jump from railing to railing and other structures to get near the gate entrance of the citadel. When you reach this destination and Altair is standing the scene will start and you are in the huddle of William, King Richard, and other soldiers. You can now walk inside the citadel to where William will appear after the scene. The camera view will focus on the scene outside, so steering your way in there can be tricky. You'll know if you've reached the target's room because there are two guards posted on either side of the entrance outside of it. Stand behind the table on the far side of the room and wait for William to appear by it after the scene ends, mashing the assassinate button. You know what happens next- William gets owned!!!

http://www.youtube.com/watch?v=GE8pasIfL14

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".

http://www.youtube.com/watch?v=nIIM2_i9w6c

Here are some extremes of hiding in plain sight.

William: After William is done lecturing his men, he goes to his desk to study a map. You can climb down behind William and blend right next to him. If you bump into the table, William will notice you, so you need to be careful as you approach the table. In this video, I line up Altair's shoes with William's shoes to ensure that Altair doesn't bump the table.

http://www.youtube.com/watch?v=O-u0iVW3vv8

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.

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. (In this video I fail to remain Anonymous on Abu'l.)

http://www.youtube.com/watch?v=MNC1WvHV6cY

Frequently Asked Question: I'm on Memory Block 4 and there's nothing left to do on my map. What now?