oh come on, it's hardly impossibleI've done it plenty of times on advanced in the same day
But have you done expert?
so ya and I've played it and beat it but for some reason it wont let me play on all maps on survival mode for example it won't let me play in hospital on survival mode.this map. http://www.youtube.com/watch?v=_sNs4temoU8
You can't beat left 4 dead in one day.
If he has time, a great team, and skill it possabile.