Ubisoft has launched an Assassin's Creed game on social networking site Facebook.
Project Legacy is a training simulator for Templar company Abstergo Industries.
You use action points to complete memories, which in turn earns experience points and money. There's levelling up, skill points, units and all sorts of gubbins designed to hook you in.
You earn Uplay points as you play, which can be redeemed for rewards in Ubisoft games. As you unlock landmarks and items in Legacy, the corresponding items will become available in Brotherhood. Playing the single-player game on your console will in turn unlock 25 exclusive missions in Legacy. This must be the convergence thing everyone's banging on about.
Assassin's Creed: Brotherhood will be released in the UK on 19th November for the PlayStation 3 and Xbox 360. The PC version is due out next year. Will Porter went hands-on in September.