Marble Genius Marble Run Super Set - 100 Complete Pieces + Free Instruction App (85 Translucent Marbulous Pieces + 15 Glass Marbles) 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 (15 Glass Marbles Included)