In this solitaire game, the object is to remove groups of three objects which match specific criteria. Each object on the board has 4 attributes: color (red/blue/black), shape (cube/sphere/diamond), size (small/medium/large), and opacity (wireframe/translucent/solid). A set of three objects can be removed if for each attribute, they are all the same or all different. For example, a small red solid cube, medium red solid diamond, and large red solid sphere would be a valid set; they all have the same color and opacity, and different sizes and shapes. Sometimes there will be no valid set among the 12 objects; in that case clicking on the white square in the bottom right will reveal three more objects in the bottom row. (If nothing happens when you click the white square then there is a valid set; look harder!) The game is over when there are no valid sets and no more pieces to add.


A valid set is the small black wireframe cube, medium blue translucent sphere, and large solid red diamond.