AC: Brotherhood 'Rome by Night' map variant to be unlocked after 25M collective kills

Rome is a beautiful place to sneak around, covertly murdering targets and avoiding pursuers, but perhaps you find the scorching Italian sun too much with that silly harlequin outfit on? You'll be glad to hear, then, that Assassin's Creed: Brotherhood's Rome multiplayer level will be cloaked in darkness when a nighttime variant is unlocked as soon as the collective player base reaches 25 million kills (though it's unclear if the goal is platform-specific or truly collective). How's that for a brotherly bonding exercise?

Progress toward the unlock is being tracked on Ubisoft's Assassin's Network under the "Events" tab. While Ubisoft Germany claims that tracking has already begun, the count currently appears to be hidden -- as of publishing, the counter reads a single donut (pictured). That's okay though! It's only more incentive to hop back into AC: B's addictive multiplayer and sneak-stab some fools.

Update: Ubisoft confirmed that the 25 million number is across both Xbox 360 and PlayStation 3 platforms.