They may be able to offer recommendations based on their experiences working at the casino. Ask casino employees: Slot attendants and managers at Mystic Lake Casino may have inside knowledge about which machines are the loosest.This is because the casino makes more money from high-denomination machines, so they can afford to offer higher payout percentages. Check the denomination of the machine: Generally speaking, machines with higher denominations (such as $5 or $10) have higher payout percentages than machines with lower denominations (such as 25 cents or $1).Look for machines with payout percentages of 90% or higher for the best chances of winning big. Look for machines with high payout percentages: Mystic Lake Casino offers a variety of slot machines with different payout percentages.While there is no guaranteed method for finding the loosest machines at Mystic Lake Casino, there are a few tips and strategies you can use to increase your chances of winning big: Mystic Lake Casino offers a variety of slot machines with different payout percentages, and some machines are known to have higher payouts than others. What Are the Best Slots to Play at Mystic Lake Casino? However, it’s important to remember that these percentages are based on long-term play and are not a guarantee of immediate winnings. Slot machines with higher payout percentages are known as “loose” machines, and these machines are more likely to pay out winnings over time.