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Internal courtyards is how you add light and air circulation to a large floor plan, typically

I've seen (but not entered) casinos in office towers. I imagine you have the sea of slot machines on the first floor or two, and then table games and high roller rooms on the upper floors.

For a las vegas style ginormous casino and hotel, many of them have the casino footprint much larger than the hotel footprint. You could have big diffused skylights over much of the gaming area, if you wanted. Of course, you'd augement that with lots of artificial lighting, so it would save energy, but not change the experience of roughly constant lighting 24/7

Skylights

I thought about that after I wrote the comment although a lot of the time there's convention center and other expansive spaces above the casino.

Works for the floor that is under the roof.