Scavenger Hunt: Reveal next point only after correct code

Add the ability to keep all points hidden until the correct code has been entered. For example a scavenger hunt has five numbered points, with the first point shown at the start of the scavenger hunt. The only way to reveal the second point is to find and enter the correct code from the first point. This way you can force a specific journey and keep locations a secret/suprise to players. I hope that makes sense...