Any gambling slot machine programs?

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I know the title sounds confusing but I was wondering if anyone knew of like a program or something that you pay like 25$ or something and you can gamble and play slots and win money etc. etc.... Cus my uncle plays one and he makes good money off it but I keep forgetting to ask what it's called. If anyone knows of what it could be or similar things out there please let me know, trying to find a way to make some xtra cash on the side while I'm online anyways