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Riviera Hotel and Casino; slot machines ticketless or quarters? - at casino slot

I'm going to Vegas in 2 days and wondered how the slots. I do not think put in more neighborhoods, that something like a bill or a piece of paper?

We stayed @ Blue just to save money, but I'm curious to see how the work of slots at other casinos, too.

Therefore, all information that can help you, is greatly appreciated.

Thank you in advance.