An Unrimmed Curve is a curve in the sand course which has only a very slim rim at the outher edge so marbles can easily fly out of the curve, there is however an alternate path next to the unrimmed curve which leads the marbles back to the main course. The alternate path is usually slower and longer than the main path. Ghost Plasma and Blizzard Blaster in particular are very good at making sure they do not fly over the rim and take the slower alternate path.
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