The object of the game is to drop each colored ball into the correct shell. Your opponent mixes up the shells after each turn. At the conclusion of the round, count how many balls you guessed correctly. From the back of the box: "An exciting fast-paced sliding, shuffling, memory game... reminiscent of the old "shell game." The object of the game is to drop each colored ball into the correct shell. Not so easy. Your opponent mixes up the shells after each turn At the conclusion of the round, count how many balls you guessed correctly (1 point for each ball), then switch roles with your opponent. A complete match is the best 2 out of 3 (or) 3 out of 5.