This document discusses common elements in video games that keep players engaged. It begins by asking why players can't put games down and why they get better as they play. It then discusses common goals players want to achieve in games, obstacles that impede progress, and tools players use to overcome obstacles. The document also covers the ability to fail and try again through mechanics like extra lives and health bars. It explains how gameplay leads to learning skills that transfer between similar games. In the end, it discusses how games create a balance between failure and success loops to teach players through mistakes in a way that keeps them progressing.