pretty simple really - just pay attention to comments and add whatever your guests are complaining about. Essentially, an elevator shaft for every room :) And I'm amazed at the number of people who seem to want to stay in a presidential suite !
WOW how much does level 25 stink. Was fun solving the puzzles until I got to that one and ripped my hair out because I couldn't time the middle jump. Why take a puzzle game and turn it into a random frustration on the last level.
Love "Garden Gates" - it's symmetrical so that you can figure it out quickly ! And the final level is actually pretty easy - just a bit longer than the others. I spent a long time calculating things like: 2 of 4 squares here are empty, therefore there must be a square over here - when in reality there's always a very straightforward solution adjacent to already solved squares. You just have to find it.