Professional slots players are a secretive group. They roam casino floors looking for slot machines they believe to be on the verge of making large payouts.

However, there’s often as much wishful thinking involved as skillful thinking. While +EV (positive expected value) situations do exist, there’s still luck involved with all slot machines.

“A typical progressive jackpot, where the jackpot’s value increases over time, hits randomly,” slots designer Peter Downie explained.

Yes, there are slot machines in casinos that are more likely to hit jackpots. But even those increased chances are only chances. That said, one type of slot machine has a jackpot system that can be gamed, and there is a small group of legitimate professionals who can correctly identify those machines and successfully profit off them.

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