Putwoody's Castle is a Fine Free Game from Cheapass Games.
The board consists of a 5 x 4 grid representing the castle. Owners of the game supply their own colored stones (5 red, 8 blue, 11 white). On a player's turn he places a stone of any available color on any empty space in the castle. The player immediately scores 1 point for every stone of the same color adjacent to the placed stone.
The winner is the player with the most points.