Gavin and Phil visited over Christmas and we played a lot of Zendo. The game is really addictive and fun. It can be as simple or difficult as you please (depending on current alcohol intake) and you can play for 10 minutes or 2 hours. We found that we quickly forgot about who was winning, we got so wrapped up in the puzzle of trying to guess the Master's Rule. The small deck of example rules was very useful, but the game really came into its own when we progressed enough to start inventing our own rules.