Summary: Instructions in mobile applications must be designed for optimal scannability, as users tend to dismiss them quickly and do not read thoroughly.
Almost every app on the market today has some sort of coach mark (a transparent overlay of UI hints) or tutorial shown on the first launch. While the presence of such instructional screens is often unnecessary, there are times when it is helpful to the user to get a nudge in the right direction. If you have decided to include a coach mark or some other form of hints and tips to explain a unique feature of your app, follow these guidelines to increase your odds of the tip being seen as helpful, and not as a hurdle to jump past.