Add a puzzle race game

[donkirkby]

Mephisto is a game by Christian Freeling that's a bit like Ricochet Robots.

• Use a chess set for the pawns: pawn, rook, knight, bishop, and queen.
• Use a white set of chess pieces to identify which die goes with which piece, and use a black set to run around the board.

[donkirkby]

After trying Mephisto, I don't love it. I do like the idea of a puzzle race game like Ricochet Robots or Set, so maybe I can come up with a more appealing puzzle generator.