The idea behind the Review Contest is pretty simple. Every Saturday we draw one user review each from the previous week's new releases. The authors of each of those reviews get a free promo code for their effort, which can be used to get any game in our catalog.
This week's titles and their respective winners were:
Myst: Masterpiece Edition - mentat,
Tropico Reloaded - antihippie.
Next week's titles will be:
Combat Mission: Beyond Overlord,
The Manhole: Masterpiece Edition.
And the rules of the Contest are:
1) You're free to write a review for all games participating in the Review Contest event.
2) The review(s) must be decent or better. ;)
3) The review(s) must not be a copy of a review from a different website.
4) One winning review per game will be drawn from all applicable reviews written before Saturday 6:00 a.m. EDT,
5) You don't have to own the game at GOG.com to participate.

Thanks for bringing this to my attention. I sent the code moments after drawing the winners, so I can't do much here. I suppose it's a lesson I've learned the hard way - I'll check the reviews more thoroughly (the winning GC2 review was about 30% original) in the future. I've agreed with Cook to draw another winner of last week's Review Contest - sundermk2. If his review isn't original, I'll need better tools than Google to determine otherwise... ;)