Introduce this game with a 3x3 grid using three colors and three of each color. (Subsequent games can use grids of a larger size. A 4x4 grid uses four each of four colors and so on.) Ahead of time, prepare a “key” grid with each of the nine squares colored (or use letters to represent colors). All the squares of one color are linked together along one full edge (i.e.: they can’t be separated nor can they be linked only diagonally). Label the rows/columns 1-2-3. A student asks for information for any row or column. For example, a student asks for row 1.

The teacher then writes the number of times each color appears in row one (see above). Students continue to ask for information and deduce the color of each square.

from:

http://washmath.org/files/GamesAndActivities.pdf