Really, you gotta breadboard, right?
This is a logic-driven game of snap, but with dice rather than cards. It uses a XNOR! If I remember correctly, that sketch on the post-it was for detecting and determining a match on the two LED die, turning on a player's led if they pressed the button correctly before the other player (and not if they didn't.) I'd post a circuit diagram but about 1/4 of this is Charles Platt's work not mine so I don't feel it would be right. I just came across the photo today and thought it was quite impressive - I keep thinking of going back to it and actually building it up and encasing. It actually drove one of my very first questions on Element14 - I'd used an open-drain XNOR and didn't understand why it wasn't working.
