I'm wondering... of all the games played this year, which games were your favorites to grab trophies in? What specific trophy was your hardest/most rewarding?
As for myself, I think the trophies in DiRT 2 were really fun to get... Some of the titles were pretty funny (Two Girls One Cup, Best Friends Forever) and the game was just really fun to play both on and offline... Quite thrilling when you apply the handbrakes upon the approach of a hairpin turn, and then accellerating up to 150 mph along the edge of a cliff! Then bumping an online oppenent off of that said cliff and earning the trophy for winning an online race. Hahah.
I also dug Uncharted 2... because there is a series of trophies that asks for 20, 100, and 250 headshots. There's also one for getting 5 in a row. Haven't had this much fun hitting those headshots since Unreal Tournament. Shave and a haircut!
Even though the game was released the year prior, the hardest was the platinum for Call of Duty: World at War, whose trophy I got this year... The plat involved finishing the entire game on Veteran difficuty... When you see 10+ grenades on your grenade indicator, you sometimes ask yourself "why do I even bother?".... CoD:MW2 Vet mode is MANY TIMES easier than this WW2 shooter.

I could use the extra practice.
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