The recently released Uncharted 2: Among Thieves for the Sony PlayStation 3 has continued to impress as the weeks and months press on, but this weekend that may change as developer Naughty Dog is giving the hardcore fans what they want by making the game much more challenging.  Until Monday, December 7, all multiplayer games will be played on the equivalent of the single-player "Crushing" difficulty level, meaning that players will only have 65% of their usual health.  If you're someone like me who enjoys Uncharted 2 multiplayer but isn't all that good at it, get ready to be frustrated if you play the game this weekend.  Hey Naughty Dog, how about a weekend experiment where everyone is armed with the M32 Hammer grenade launcher by default?  Maybe then my puny Level 14 character and I would stand a chance.