Is it harder to make your people happy?
The reason i ask this is beacuse i thought when you changed a difficulty level, the only thing that changes is the AI economy and the way they think. I didn't think anything else was effected, maybe i'm wrong, beacuse i have 3 unhappy planets on challenging, whne i had tons like them on normal and they were at least twice as happy with the amount of happiness buildings i put on each planet compared to the food i put on each planet.