Inter-Connectivity - Unlockable Content
Ubisoft has made it possible to link your "Bloodlines" character and your "Assasin's Creed 2" character on the PS3 via link cable. There are special items you can only unlock by collecting hidden items in both games and transferring them across consoles. To unlock "Assassin's Creed 2" items, you need to collect gold templar coins in "Bloodlines." For "Bloodlines" items, you have to collect codexes in "Assasin's Creed 2."
Hidden Blade Slim Blade Codex
You must play through "Assassin's Creed 2" on the PS3 to find the Slim Blade Codex. After linking systems and transferring the codex, this will unlock a blade for your character in "Bloodlines" that allows your counterattacks to do more damage and your counterkill skill becomes more effective.
The Hidden Blade Armor Codex
After you have collected the Hidden Blade Armor Codex in "Assassin's Creed 2," transfer it over to "Bloodlines" to grant your character the ability to block while the Hidden Slim Blade is equipped. This is a purely defensive item but it is very useful.
The Hidden Gun Codex
Locate the Hidden Gun Codex in "Assassin's Creed 2" and transfer it to "Bloodlines" to enhance your Hidden Slim Blade. When you use the slim blade at medium range, your character will now shoot flaming knives from the tip of his sword. This ranged attack does moderate-high level damage.