I wish there were more games like this. It’s such a simple premise but so satisfyingly difficult after each level. And it even has a bit of randomish failure which makes for even more challenge.

This is great, but to me, the definitive elevator scheduling game was SimTower.

looks very well made, but I still prefer https://en.wikipedia.org/wiki/Elevator_Action !

I always come back to this game whenever I'm at a hotel for a conference waiting for the elevator.

Wow, I just came here to comment that I've always wondered if a game where you have to program an elevator scheduler would be any fun. I thought surely no-one's thought to make that before, too! Glad to be proven wrong.