It kept me up waaay too late last night... but I think I can finally ignore the surface in my gnomoria game for the most part. Here it is fall of year 5, and I have a simple entranceway trap that makes bad guys think they have an easy route into my fortress. But when they step on the pressure plate, mechanical walls rise up to block the main route, and close the hatch on a trapdoor that leads to an alternate "door" leading in. So bad guy stops for a half second when his face hits an instant metal wall, turns around, sees another metal wall behind him, oh look there's a door over there...
He steps off the pressure plate, onto the hatch. Hatch opens. Bad guy free-falls 10 levels to a special corpse stockpile I labeled "The Sudden Stop." SMACK. Watching the invasions roll in is like... pachinko. They all dribble down into the hole, and now I'm drowning in iron and steel to smelt, had to double my smithing capacity to deal with it all.
At first I was elated because I was owning full-steel-clad goblins and two-headed ogres. Then I was sad because "Oh no... did I just beat Gnomoria?" Then I was happy again because I remembered there are still 102 deep, dark, hellish levels of "fun" below me, chittering, skittering, just waiting to be dug up.
Just have to remember to flip the switch to turn the traps off on the 5th day of each season till the merchants arrive, then turn em back on.