A small percentage of every bet feeds a shared jackpot pool. The pool grows until someone hits it, then resets to a seed amount. Wide-area progressives (across multiple casinos) grow the biggest.
Always bet max to qualify for the full jackpot. Look for games that have not paid in a while (the statistically "owed" period). Set a separate jackpot budget.
The odds of hitting a wide-area progressive are similar to winning the lottery. Play for fun, not as income strategy.
I review jackpot slots and their current pooled amounts at coolshades.net.
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