Slots
Slots are most of what a casino owns and most of what it earns. Reels spin, a random number generator decides where they stop, and the paytable pays what it pays. That much has not changed since the machines were mechanical. What has changed is how much is now configurable behind the screen, and almost none of it is configurable by you.
This page is about the parts that affect the cost of playing: the return setting your casino chose, the volatility nobody prints, the win cap in the terms, and the bonus rules that decide whether any of it matters.
The same slot is not the same slot everywhere
This is the most expensive thing on the page, so it goes first. Providers ship most titles at several return settings and the operator picks one at integration. A game the studio designed at 96.5% is commonly deployed at 94%, and some are available as low as 88%. Nothing on the screen differs. Same symbols, same features, same trailer, and several percent more per spin.
| Setting | Cost per 100 staked | Cost over 5,000 staked |
|---|---|---|
| 96.5% | 3.50 | 175 |
| 94.0% | 6.00 | 300 |
| 92.0% | 8.00 | 400 |
| 88.0% | 12.00 | 600 |
The figure that applies to you is in the game’s own information panel, behind the question mark or the burger icon, usually on the last page of the paytable. Open it before the first spin. If the panel quotes a range rather than a single number, or omits the figure entirely, treat that as an answer.
One warning about that panel, from an operator that puts it in writing. Stake‘s terms reserve the right to adjust the house edge at its sole discretion without prior notice, and then state that in the event of a discrepancy between Stake’s house edge and the RTP displayed in-game you should contact support, and that it accepts no liability whatsoever should you place a wager in reliance on the displayed figure. Most casinos reserve the same right and simply do not mention it.
The exception worth knowing is Riobet, whose Game Rules page publishes every one of its 16,744 titles with the theoretical return actually deployed and the percentage that title contributes to wagering, sortable by either. It is the only operator on this site where the question can be answered for the whole library in one screen rather than game by game.
Volatility decides what the return feels like
Two slots at 96% can behave nothing alike. Volatility is the size and spacing of the wins that make up that percentage, and it is the difference between a game that drips and a game that starves you and then pays in one spin.
| Volatility | Hit frequency | Typical top win | Suits |
|---|---|---|---|
| Low | Around 1 spin in 3 | 500x to 1,000x | Clearing wagering, small bankroll |
| Medium | Around 1 spin in 4 | 1,000x to 5,000x | General play |
| High | 1 spin in 5 or worse | 10,000x and up | Large bankroll, long sessions |
The practical rule is short. If you are clearing a bonus against a deadline and a maximum bet cap, low volatility is the arithmetic answer no matter what the game looks like, because you cannot bet large enough to survive a high volatility dry spell inside the time allowed. If you are playing your own money with no deadline, volatility is a taste question and nothing more.
Mechanics worth knowing the names of
- Paylines and ways. Older slots pay on fixed lines. Most modern ones pay for matching symbols on adjacent reels in any position, which is where 243 ways and 1,024 ways come from.
- Megaways. A Big Time Gaming licence where the symbol count per reel changes every spin, topping out at 117,649 ways. The number is large because the individual wins are small.
- Cluster pays. No lines at all. Symbols pay when enough of them touch, usually with a cascade that removes winners and drops replacements.
- Hold and win. Coin symbols lock in place and respins reset each time a new one lands. Usually a separate jackpot ladder sits on top.
- Bonus buy. Pay a fixed multiple of your stake, commonly 60x to 100x, to trigger the feature immediately.
Bonus buy deserves a sentence of its own. It is not better value and it is not worse value in any dramatic sense, it is the same return delivered in one expensive transaction rather than two hundred cheap ones. Some titles run a slightly different return on the bought round than on the base game, and the info panel lists both. What it always does is multiply your turnover by a hundred in a single click, which is why it is banned outright while wagering a bonus at most casinos, and banned entirely in some regulated markets.
Max win caps, and the second cap in the terms
Every slot has a maximum win, printed as a multiple of the stake. 5,000x and 10,000x are common, and a handful of high volatility releases go to 50,000x. When the cap is hit the round ends there, whatever the remaining spins would have paid.
The second cap is the one that costs people money. Casino bonus terms usually carry a maximum win from bonus funds, often expressed as a small multiple of the bonus or a flat figure, and it applies no matter what the slot paid. Winning 8,000x on a spin funded by bonus money at a casino with a 10x cap means collecting 10 times the bonus and watching the rest be removed. That clause is in the terms, not in the game, and no slot will warn you about it.
Studios, and why the footer list is not evidence
Provider logos get copied between casino footers constantly, and a game count is the easiest number on a website to inflate. The studios doing the work worth seeking out are Pragmatic Play for volume, Nolimit City and Hacksaw Gaming for high volatility mechanics, Push Gaming and Print Studios for mid-range design, Play’n GO and Relax Gaming for consistency, and Big Time Gaming for the Megaways originals.
What matters more than the list is whether those games load for you. Studio licensing is country by country, so a lobby that shows 6,000 titles from one location can show 2,000 from another, and the count in the marketing is always the largest one. We check this from the account rather than from the footer, as part of the method on the how we test and rate page.
Slots are the one thing bonuses are built for
Unlike crash games and live tables, slots contribute 100% towards wagering at almost every casino. That is the whole reason deposit matches exist: a 96% game turned over thirty-five times returns the bonus to the operator with room to spare. It also makes slots the only sensible place to clear an offer, since a 10% contribution elsewhere means staking ten times as much for the same progress.
Three clauses decide whether an offer is worth taking, and all three are about slots. The maximum bet while wagering, commonly 5 units, which stops you clearing quickly. The excluded titles list, which usually removes the highest return games in the library. And the expiry, which turns a large bonus into an impossible one. The offers where these are reasonable are compared on the welcome bonuses page, and the ones with no playthrough at all are on the no wagering page.
How big that exclusion list gets is worth a real number. At Stake, taking a deposit bonus locks you out of 47 studios and 678 individual titles, plus every game from 3 Oaks Gaming and Playson and 22 of the Originals. Stake also credits wagering by house edge rather than by money staked, calibrated to a 4% game, so a low-edge slot can credit as little as $0.25 per $1 wagered, and a plain deposit with no bonus at all still carries a 100% turnover requirement before withdrawal under clauses 8.5 and 8.10.
None of that is hidden and all of it is unusual enough to check for. The full set of clauses that decide whether a payout actually happens is in the guide to reading casino terms, and the arithmetic of when a rollover is worth taking is in what a wagering requirement actually costs.
How slots compare against crash and live play on return and pace is set out on the casino games page.