I'd have special "nightmare events" that had no chance to trigger in easy mode. A very slight (One in one hundred) chance to trigger in Normal. A small chance in hard (One in twenty) mode and Nightmare mode would drop that to ensure there is at least one nightmare mode will trigger at game start.Enigma wrote:
What would you envision in Nightmare mode? A warden of a prison colony expected to terraform the toxic planet they're on into a paradise with a bunch of worst of the worst scum mankind has to offer?
Example nightmare events
A. Death to humans!
Hostile alien species has appeared, destroyed earth and your colony is the last hope of humanity. Also those aliens? They are looking for you... clock is ticking
B. Welcome to the Jungle
Remember the alien from "Aliens?" Or the alien from "The Thing?" Guess who's trying to set up a colony on someone's home territory?
C. Fuck this place in particular
The planet hates you. It could be massive technonic activity making complex buildings impossible or solar flares have a bad habit of frying the planet or the orbit takes you through an asteroid belt every few years, there is something about the planet that stands a big chance of making your colony into Neo Pompeii. What type of major natural disaster it is you have no idea. Maybe they have super storms or ultra mega lightning or the star of this planet is due to explode not in a few million years but fifty.
D. You have nothing to lose but your chains
A large group of your colonists lied about who they were, you arrive on planet they break off or attempt to take control of the colony to establish their perfect (insert here) system of government instead of you.
E. Gunsmoke
You arrival to the planet went... poorly. A good deal of the colony is dead in the atmosphere entry and the rest of your ships are mostly scrap. Have fun
I had a few more ideas but the idea is Nightmare is hard plus some massive and creative problem to deal with from day 1 you must address before even setting up your mayors hot tub and water slide.