set game play online

Who finds the set of 3 cards.
In the game, certain combinations of three cards are said to make up a set.
For each one of the four categories of features color, number, shape, and shading the three cards must display that feature as a) either all the same, or b) all different. Put another way: For each feature the three cards must avoid having two cards showing one version of the feature and the remaining card showing a different version.