Here are the rules of the contest:
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.