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Happy Halloween, gamers! To celebrate this ghastly holiday, CD Projekt RED is launching The Doppler Effect Contest on Facebook. Gamers can send in pictures of themselves dressed in Witcher-themed costumes, with a chance to get their digital visage placed on characters in the upcoming The Witcher 2: Assassins of Kings.

Not only do you get to star in an RPG, but if you win, you get a free copy of the game as well. This would fall under the “treat” category of trick-or-treat, if you’re wondering.

Head on over to Facebook or for all the details.