Slots are the simplest game in the casino to play and the hardest to read. There is no strategy to learn, but there are three numbers that tell you most of what you need to know before you spin: the return to player, the volatility and the number of ways to win.
Every spin is independent
An online slot uses a random number generator to decide where the reels stop. The result is fixed the instant you press spin, and it has no memory. A slot is never "due" after a long dry spell and never "cold" after a big win. The spin you are about to make has exactly the same chances as the one before it.
RTP: the long-run return
Return to player, or RTP, is the share of all money staked that a slot pays back over a very large number of spins. A slot with a 96% RTP keeps 4% on average, which is its house edge.
RTP is measured over millions of spins. In a session of a few hundred spins your own result can land far above or far below it. Treat RTP as a way to compare games, not as a forecast for tonight.
One detail worth knowing: the same slot title can be released with more than one RTP setting. Open the game's information screen and check the figure for the version you are playing.
Volatility: how the return arrives
Two slots with the same RTP can feel completely different. Volatility describes how the payouts are spread out.
- Low volatility slots pay small wins often. Your balance moves gently and a modest budget lasts longer.
- High volatility slots pay less often, with most of the return packed into rare larger hits and bonus rounds. Expect long quiet stretches.
Neither is better. Match the volatility to your budget and to how long you want to play.
Paylines and ways to win
Classic slots pay on fixed lines that run across the reels. Many modern games drop lines entirely and pay for matching symbols on adjacent reels, counted as "ways". A five-reel, three-row slot of this kind has 243 ways to win. Games with reels that change height on every spin can offer many thousands of ways.
More ways does not mean a better return. It only changes how wins are formed. The RTP already accounts for it.
Common features
- Wilds stand in for other symbols to complete a win.
- Scatters pay or trigger a feature wherever they land.
- Free spins rounds give a set of spins at no extra cost, often with multipliers or extra wilds.
- Multipliers increase the value of a win.
- Bonus buy lets you pay a fixed price to enter the feature directly. It is expensive per round, so size it against your budget.
Free spins from a bonus
Free spins awarded as a casino bonus are different from a free spins round inside a game. Winnings from bonus spins usually come with wagering requirements. Our guide to casino bonuses explains how to read them.
Before you spin: check the RTP on the info screen, pick a volatility that fits your budget, and choose a bet size that gives you at least a couple of hundred spins. Then decide when you will stop. Our bankroll guide shows how.