This video demonstrates how to create a procedurally generated endless runner type of game. That means that the game is different every time you play it. Download the template at the scirra store at : https://www.construct.net/en/game-assets/game-templates/endless-runner-107
Contact me on Fiverr if you want further assistance :
https://www.fiverr.com/bartalluyn/assist-you-in-creating-your-construct-3-project