Two machines can look identical and still feel nothing alike. One seems to pay on every other spin. The other sits quiet, then drops a large award. Players often call both of those feelings “payback.” They are measuring two different things.
Hit frequency
Hit frequency is how often a paying combination lands. A pay of one credit counts the same, for this measure, as a pay of a thousand. The question is only whether the spin paid at all. A high-frequency game hits often. A low-frequency game does not.
Payback percentage
Payback percentage, sometimes called return to player, is the share of wagered money a real-money machine is built to return over a very long run. A machine set near the top of a casino’s range is called loose. One set lower is called tight. Two cabinets with the same theme and the same printed paytable can still be set differently, even when they stand side by side. Casinos that want the number known sometimes publish it. Otherwise it is a question for that operator, not something you can read off a short session.
Published ranges for real-money slots are often discussed as sitting somewhere between about 75% and about 99%, depending on the house and the game. The long-run figure stays under 100%. That is the house edge. A lucky hour does not repeal it.
Often and small, or rarely and large
Designers trade one for the other. A five-reel, many-line game is the familiar high-frequency case. The bet is multiplied by the number of lines, and a line or two may pay on most spins. Those pays are often smaller than the bet, so the credit meter can still fall while the game “hits” constantly. The other family pays less often and pays more when it does. Classic 3-reel games, including the ones on Slothill, tend to live closer to that second feeling: fewer hits, and a paytable that saves its largest award for a rare line.
Neither number tells you what the next spin will do. Frequency describes the rhythm. Payback describes the long run. For how each spin is actually chosen, read what goes on behind the scenes. On Slothill the meter is entertainment credits only. Use these ideas to read a paytable, not to chase a cash return.