Although normally devoted to competitive multiplayer modes, this weekend's The Lab - an experimental custom playlist that is featured every other weekend - ramps up the difficulty of two Uncharted 2's Co-Op Arena modes.
Aptly named "Co-Op Crushing", jumping into select Co-Op Arenas will grant you and your partners 20% less health than usual. The Lab playlist includes game type Gold Rush on maps The Plaza and The Village, and game type Survival on The Lost City map. Check it out now - it's live until Monday at 10:00 Pacific Time.
Source: Naughtydog.com