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Half-way down the moguls of Free Fall, you will have an option to cut off to the left or continue straight down.
Taking the option to the left is the mogul line called Undercut, which is similar in nature to Free Fall featuring the same steepness of the slope and shaded moguls.
However, the two runs end up at different points.
Taking the left instead of continuing straight will drop you off on the traverse to ski back to the base of the Solar Coaster Express, or also giving you access to Lower Gear Jammer.
Continuing straight through Free Fall will drop you off right at the lift line at the base of Solar Coaster.