The object of the game is to identify sets of 3 cards from 12 cards placed on the board. The game ends when all of the cards have been dealt and there aren't any more sets. You can check if there is a set on the board with the No Set button, and if there is no set the cards will reshuffle.
Each card has 4 attributes:
A set consists of 3 cards where each of the cards' attributes are either the same or different. In other words, the three cards must either all have the same shape or all have a different shape, and the three cards must either all be the same color or all be different colors. If two cards have the same attribute and one card has a different attribute, it is not a set.
Examples of a set:
All three cards have the same shape, same color, same shading, and different numbers.
All three cards have the same color, same number, same shading, and different shapes.
All three cards have the same number, different colors, different shading, and different shapes.