Con your cranium with the world's first single player memory game! Keep track of which crab is hidden under which shell as you sort and scramble in this fun twist on a classic. Arrange the Crabs and stones to match the starting position on each challenge and hide them under the shells. Swap the shells along the arcs until the crabs are in the end position. Pay close attention, if you forget where the Crabs are hiding you might uncover a stone! Have fun as you hustle in your head with this great new memory game.