If you write a story now, you can enforce that a user is switched to survival mode. This is specially important in flatlands and city stories where you do not want to user to fly or be invincible. Now you can build traps! Of course, for the obvious reasons, you cannot enforce creative mode however.

Also, if you do not want users to jump into your story somewhere in the middle or skip parts of it, simply tell them the last 2-3 letters of the NEXT code in any part of the story. On the next sign, you replace those 2-3 letters with “?”. If a user uses a code with a ? in it, the program will ask him to find the previous story to get the missing code pieces.