Ryuge was asked by a monk, "What is the meaning of Daruma's coming from the West?" Ryuge said, "Wait till the stone turtle speaks words of explanation and I will tell you." The monk said, "The stone turtle has spoken!" Ryuge said, "What did it say to you?" The monk was silent."
-Zen and Zen Classics, Volume 3, Blyth
People who imagine that Zen is a game better be ready to play!