India, Nov. 18 -- Basim assumed he had put his past behind him. But Ubisoft appears to be hell-bent on reemerging it. Thus goes part of the engine for the new Valley of Memory update to Assassin's Creed Mirage, arriving two years after the launch of the base game. Most of the community was convinced that the studio had pushed off versions after the initial reaction to Mirage and moved on to newer projects; instead, Mirage surfaces again with a new trailer, a massive patch, and a full region that feels as though the developers sifted through an old chapter and opened it for players who wanted to step back inside.

It is uncommon for an Assassin's Creed title to receive this much support or attention so late in its life cycle. That makes ev...