In Sand Marble Rally, dummy balls can be placed on the course usually on wide sections close to the finish, but can also be placed close to other obstacles. The dummy balls are in fact sphere-sized obstacles which will roll down the course after been hit by the marbles. Dummy balls sometimes can push away other marbles because they usually move faster than the competing marbles. Dummy balls can also "activate" other obstacles like trapdoors or the Rotating Chevron Sign, and they can also got stuck or escape the track. If a dummy ball crosses the finish line, they won't be shown on the results list. They are just there to hinder the marbles.
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