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Topsy is almost an extension of Splain's Gulch.
After you get off the Painter Boy lift, head back the way you came onto Splain's Gulch and bear right off the trail as it opens up and when you get off the groomer before the aspens you are on Topsy.
You can wiggle some turns in before you have the option to stay left to get back on to Painter Boy or bear right on a cat track through the trees that stays parallel to Houston as it joins Lower Keystone.