Your goal in this game is to match as many leaves of three as possible.
Leaves match according to three characteristics: type, color, and
rotation speed. A match will score you a point. For each characteristic,
the three instances have to be all the same or all different.
For example, here is a matching group of three leaves. Here they are all green and not rotating, but are of different leaf types.
The next example is little less intuitive; all three characteristics have instances that are all different. In other words all three have different types, colors, and rotation speeds:
follow the leaf to the right...