Gecko Run: Marble Run STEM Edition from Thames & Kosmos brings marble-run physics to vertical surfaces using flexible, bendable tracks and residue-free nano-adhesive pads that attach to doors, windows, cabinets, and other smooth surfaces; the open-ended kit encourages hands-on experimentation with gravity, momentum, and engineering through creative builds and stunts and includes tracks, adapters, stunt elements, marbles, and an illustrated manual to guide play and learning.