181 see-through Marble Run pieces allow you to see all the action | Solid plastic pieces that stick together and are easy for kids to play with | 42 action pieces and 9 solid bases to ensure maximum enjoyment | Standard Toy Size Marbles (5/8 inch or smaller) work with this set (20 Glass Marbles Included) | Compatible with Marbulous Marble Run Toys including our Marble Genius Marble Run Starter Set

85 complete see-through Marble Run pieces in 19 distinct styles allow you to see all the action (we don't count pieces like everyone else - these are actual complete pieces and not parts that have to be added together! See comparison in Product Description.) | Solid plastic pieces that stick together and are easy for kids to play with | 8 solid bases including 3 large bases to ensure maximum stability (large base designs vary slightly per included pieces image) | Free Marble Genius Instruction App with purchase that includes 9 step-by-step guides, fun challenges, and regularly updated content (iOS or Android) | Compatible with Marbulous Marble Run Toys including our Marble Genius Marble Run Starter Set (60 pc.), Extreme Set (125 pc.), Booster Set (20 pc.), & 9 Accessory Sets. Standard Toy Size Marbles (5/8 inch or smaller) work with this set (65 Glass Marbles Included)

85 complete see-through Marble Run pieces in 19 distinct styles allow you to see all the action (we don't count pieces like everyone else - these are actual complete pieces and not parts that have to be added together! See comparison in Product Description.) | Solid plastic pieces that stick together and are easy for kids to play with | 8 solid bases including 3 large bases to ensure maximum stabi

10 Pieces Total (4 Pipes, 1 Ramp Sphere, 1 Alternating Sphere, 1 Straight Sphere, & 3 Tube Spheres) - Color Tubes Pictured Not Included | Compatible with Marbulous Marble Run Toys including our Marble Genius Marble Run Starter Set, Super Set, Extreme Set , Booster Set, &Accessory Sets.

80 see-through Marble Run pieces allow you to see all the action (NEW for March 2019, this set includes 20 additional pieces and 40 additional marbles) | Solid plastic pieces that stick together and are easy for kids to play with | 6 solid bases including 1 large base to ensure maximum support | Standard Toy Size Marbles (5/8 inch or smaller) work with this set (10 Glass Marbles Included) | Compatible with Marbulous Marble Run Toys including our Marble Genius Marble Run Super Set (85 pc.), Extreme Set (125 pc.), Booster Set (20 pc.), & 9 Accessory Sets

62 racing themed pieces including many see-through marble run pieces | 8 racing action pieces for exciting play | 20 designer glass racing marbles and interactive cardboard tournament bracket | Instruction manual with step by step instructions and free marble genius app with additional projects | Compatible with all Marble Genius Sets (7/8" top & 1-1/16" bottom)

105 racing themed pieces including many see-through marble run pieces | 11 racing action pieces for exciting play | 20 designer glass racing marbles and interactive cardboard tournament bracket | Instruction manual with step by step instructions and free marble genius app with additional projects | Compatible with all Marble Genius Sets (7/8" top & 1-1/16" bottom)