Learn the basics of coding with this fun Quadrilla marble run tower set! Build the towers and tracks and find the missing blocks to unlock the code! The challenges are endless with this off-screen coding marble run! Once you've set everything up you can accept the challenges on the 30 included cards and send your marbles rolling down! Includes 18 blocks, two hole shutters, one marble feeder, 10 accelerators, three escalating rings, 4 plastic escalating rings, one blue see-saw, one red see-saw, 40 marbles, one cotton bag, two marble collectors, 4 long straight tracks and 30 challenge cards. This set is a great, interactive introduction to the principals of coding and is also great for encouraging logical thinking. Suitable for ages 6 and above.