Marble Genius Marble Rails Super Set, 325 Piece Marble Run for Kids 8+ (45 Marbles, 15 Rail Pieces, 10 Base Pieces & More), STEM, Full-Color Instructions, Great for Kids & Teens Rails Set - 325pcs 1.0 is up for auction in Toys & Games. The current bid is $17.70, 55% below the $39.00 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.