Half Life 2 on Hard without dying, at all (support characters included).
I've yet to succeed, almost made it to the citadel a couple times but I got blown up by striders' warp cannons because I was taking cover and hadn't memorized where they hit yet.
I've yet to succeed, almost made it to the citadel a couple times but I got blown up by striders' warp cannons because I was taking cover and hadn't memorized where they hit yet.