How Slot Machines Work: RNG, RTP and Volatility
What random number generators, return-to-player and volatility mean, and how wilds and free spins change a slot.
Random number generators
Every spin on a digital slot is decided by a random number generator (RNG) at the moment you press spin. The reels are only an animation showing the result. Each spin is independent — a machine is never 'due' to pay, and a big win doesn't make the next one less likely.
Return to player (RTP)
RTP is the share of all wagered coins a slot pays back over millions of spins. A 96% RTP means that, on average, 96 coins come back for every 100 wagered. Over a short session your results swing far above or below that figure; RTP only describes the very long run.
Volatility
Two slots with the same RTP can feel completely different. Low-volatility games pay small wins often. High-volatility games go quiet for long stretches and then pay large amounts. Neither is better — it depends on whether you prefer steady action or big swings.
Wilds, scatters and free spins
On Lucky Loco slots, the gecko is a wild: it substitutes for other symbols and doubles the line win, and three geckos pay 100×. The golden chili is a scatter: three of them trigger 10 free spins with a 3× multiplier. Features like these move a large part of a slot's payback into rare bonus moments, which raises its volatility.
Playing smart
Set a coin budget for a session, enjoy the bonus rounds when they come, and walk away when the budget is used. With free play coins you can explore how volatility feels without any real-world cost.
Practise what you just learned with free play coins — no real money, ever.
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