Pair the Nat Geo Construction Set app with the 35-in-1 Mega and 100-in-1 Ultimate Nat Geo Construction Sets to explore and build unique, 3D motorized models including motorcycles, cranes, helicopters, dragons, go-karts, super cars and more!Move the models around and interact with each piece as you follow the 3D instructions. APP FEATURES & BENEFITS- Interactive 3D Instructions - Select your kit and build a model with step-by-step animated instructions that show you exactly where each piece should go.- 360' Exploded View - Rotate the model and pinch and zoom to see just how each piece snaps together.- Rewind/Fast-forward Function - With just one touch, dial forward and backward in the progression of your model. Watch the pieces fly together or zoom apart!- Parts List - Gather each piece you'll need for your model before you get started.- Numbered Steps - Keep track of your progress with the convenient Steps Counter.Â© 2017 National Geographic Partners LLC. All rights reserved. NATIONAL GEOGRAPHIC and Yellow Border Design are trademarks of the National Geographic Society, used under license.