I'm trying to find a movie that I really fell in love with but I can't quite remember it. It was basically a girl following these spray painted riddles, she is joined by a boy but the last one was "What eats but never drinks?" He spray paints FIRE on the wall and kills her. Does anyone know what movie I'm talking about?

Nemesis Game (http://www.youtube.com/watch?v=NEvHaal_mJo)

Thank you so much!! :D