The deck consists of 81 unique cards that vary in four features across three possibilities for each kind of feature: number of shapes (one, two, or three), shape (customizable in Options), filling (solid, hatched, or clear), and color (customizable in Options). Each card is unique. In the game, certain combinations of three cards are said to make up a KIT. For each one of the four categories of features — color, number, shape, and filling — 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. For any 'KIT', the number of features that are all the same and the number of features that are all different may break down as 0 the same + 4 different; or 1 the same + 3 different; or 2 the same + 2 different; or 3 the same + 1 different. (It cannot break down as 4 features the same + 0 different as the cards would be identical, and there are no identical cards in the deck.)