Despite playing since 2008, I’ve only accessed the hidden fun stuff once, and mostly because I set out to do it. I too tend to keep creating new forts over and over to try to get things perfect. Then I save, and when I come back I never remember what I was doing, so I just start over again. :) Doing that for all these years, my early game is down to a science now (in terms of setting up manager, work orders, quantum stockpiles, etc. The only thing that really changes from play to play is how I design the fortress. Surprisingly still not tired of doing it after all these years.