MOHAA - can't remember the map name but it was a ruined town somewhere in France iirc. German snipers, raining hard, spookily quiet, I've got to get from one side of the town to the other and all I have is my trusty sniper rifle.
I just remember sneaking around trying to figure out where to go, getting shot in the leg without even hearing or seeing the enemy....trying to figure out where he is, moving from cover to cover, looking through your scopes, scanning windows, ledges and the like until you suddenly spot him on a roof top slightly obscured by a tree...slowly take aim and headshot...one less German sniper.
Brilliant fun, actually made my heart rate elevate while playing, no other game has ever done that to me.