I also would like a clever situation like in Myst where you do something right, you get rewarded, and if you do something wrong.....
Well we have relto books for a reason right? Perhaps there could be an age where there is someone living there. If you try to go through the age in the wrong way, he attacks or confronts you, but if you do things properly, you can make friends and he gives you something.
I'm going to think on this a bit and possibly write a story about it. This should be fun.
