Set: geeky card-game that rewires your brain

“The dealer puts down twelve cards, and players hunch over them, trying to find three-card sets. For three cards to form a set, each of their attributes must either match or diverge. There are four attributes with three possible configurations each: shading (solid, outline, grey); color (blue, red, green); number (one, two, three) and shape (rectangle, oval, squiggle). It’s a little like Boggle in that the winning strategy is a combination of directed searching and general unfocusing of the eyes and trusting to intuition to make the sets pop out of the well. Players are penalized for calling out false sets, which happens all the time, since once you engage the pattern-matching centers of your brain, they can’t help but see phantom sets in the cards.”

This looks fun.
Link