Crazy Sets

Crazy Sets consists of 81 cards with symbols on it. The symbols can vary in four manners: The count can be 1, 2 or 3. The color can be red, green or blue.

The shape can be triangle, square or circle. The pattern can be empty, solid or criss cross.
In the beginning 16 cards lay open on the board. Now try to find sets of 3 cards which observe this rule: Every of the 4 qualities must be on all 3 cards exactly the same or totally different. If you think, you've found a set, click the three cards. If they build a set, they will disappear and make place for the next. The game ends, when all 81 cars are used or, what is more probably, you cannot move. The more cards you used and the faster you found sets, the higher your score.