Here are the rules of the contest:
1) You must have the game(s) present on your account to participate.
2) If you have multiple new releases on your account, you can increase
your chances and write reviews for all of them.
3) Only the review(s) of this week's new releases will be able to
participate in the contest.
4) The review(s) must meet the extremely high standards of GOG.com. ;)
5) The review(s) must not be a copy of a review from a different
website.
6) One winning review per game will be drawn from all applicable
reviews written before Saturday 6:00 a.m. EDT.