The people living in my new habitat dome have jobs to do, that’s what brought them to Mars in the first place, but when they finish work they have two choices: they can either go to the casino or the bar. I could have built a gym or some other kind of leisure facility, but I went with the casino and bar combo. It’s what I’d want if I had to live in a dome on a hostile planet.
And make no mistake, Mars is a hostile planet. That’s why Surviving Mars [official site] can be so demanding.