Have you ever wished that the first Assassin's Creed had the option to jump into another player's campaign, making it fundamentally more awesome? Well AC1 used to have this option - until it was scrapped.
During an interview with Official Xbox Magazine (OXM), Assassin's Creed 3 mission director Philippe Bergeron spoke about an ambitious co-op mode that was then cut. The co-op mode was going to be the big driving mechanic before Ubisoft stopped the idea.
"Before we knew about the Desmond story and Animus link, we had a huge co-op component in there, but it just became too hard to do: the engine couldn't support it, and then the metaphor we had above it didn't support it."
"Co-op was one of those big things at the beginning that just didn't make sense in the end"
"For us it was really part of the single player experience, to have in-and-out co-op, and in the end we never thought it made sense in the storyline that we had for the Animus."
He went on to say that it became more of a single player experience, so having a 'in-and-out' co-op wouldn't work.
"There was no way to reconcile having multiplayer or co-op in an ancestor's memories. Your ancestor lived his life in a certain way, so assuming you had branching storylines, it creates a paradox. It didn't fit."