Pre-orders ?
I wonder how far up the rank Natural Selection 2 would be based on pre-orders...
Something like 97% of all purchasers went for the more expensive "Special Edition" variant at $40 rather than $20 for the standard release.
That's some going for an as-yet unreleased successor to the original free Half-Life mod, which holds the title of "my most played game" - far outstripping my time with Elite (I got to "Deadly") and Frontier (yes, i'm an old-b'stard !)
http://www.naturalselection2.com
"I liked the original so much, I bought the Special Edition"