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Vintage 1988 DISCOVERY TOYS MARBLEWORKS #387 with Box - ALL Pieces. $57.97. or Best Offer. 14 watching Super Marbleworks Raceway Construction Set is a toy created by Discovery Toys. The marbles have to roll down the course to the end.Buy Discovery Toys MARBLEWORKS Add-On Set | Additional Pieces Compatible with Marble Run Starter Set - 130 Complete Pieces + Free Instruction App (80. We at Discovery Toys believe in the power of PLAY. It is proven that learning and interaction through play for children teaches lifelong skills preparing