Oh, ok fair enough then.
Also, from my experience, the demo was a little less-forgiving, not randomly giving you items and crap along the way, but the difficulty on both is the same. Just completed No Mercy on Advance after 2 and a half hours and thirteen retries I finally did it, my experience copied from an MSN conversation:
Proro. says:
Jesus Christ
Proro. says:
Couldn't join your game and raged so hard
Proro. says:
So some guy invited me to his instead
Proro. says:
**** was AWESOME
Proro. says:
He hasn't completed No Mercy yet though and seconds away from the Helicopter coming this Tank ******* threw him off the building and he had a medkit too I was just like "... lol." Then I started shooting it, RAN out of bullets, drew my pistols was like "**** this better not be the end!" Luckily finished it before it finished me the Helicopter came the Horde behind me I just bailed
Proro. says:
The black guy died too, it was just me and this one guy the other two were CPUs
Proro. says:
He didn't survive so he didn't get the achievement, I'd be PISSED after all that effort
Proro. says:
Though he did headshot a Witch