How Do Slot Machines Work? RNG, RTP and the Truth About 'Tricks'
7 min read
“This machine is due”, “they pay better at night”, “it’s empty after a jackpot” – more myths surround slots than any other casino game. The reality is less spectacular and more interesting: a slot is a random number generator with graphics. Once you understand how it works, every “trick” instantly reveals itself as a fairy tale.
The random number generator (RNG)
The heart of every slot is the RNG: an algorithm generating thousands of random numbers per second – even while nobody plays. The millisecond you press spin, the machine grabs the current number and translates it into a reel result. The spinning reels are pure theater: the outcome is decided before the animation starts.
Which directly means:
- Every spin is independent of the last
- There are no “hot” or “cold” machines
- Timing, time of day, weekday, betting rhythm – zero influence
In licensed casinos, RNGs are certified and continuously audited by independent labs like eCOGRA and GLI.
RTP: the payout rate
RTP (Return to Player) states how much a slot returns of all stakes long-term. Book of Dead runs at 96.21%: of every CHF 100 staked, CHF 96.21 statistically flows back – measured across millions of spins. Your session can deviate wildly; that’s exactly the appeal and the risk. The gap to 100% is the house edge.
What RTP is not: a guarantee, a payout “cycle”, or an account that fills up. The machine doesn’t know what it “owes” – it just rolls dice.
Our RTP calculator translates RTP into actual francs for your stake size.
Volatility: the temperament
Two slots with identical RTP can feel completely different:
- Low volatility (e.g. Starburst): frequent small wins – the bankroll breathes slowly
- High volatility (e.g. Gates of Olympus): long dry spells, then swings up to thousands of times your stake
Practically: high volatility demands a bigger budget per hour of play – or smaller stakes. Our bankroll calculator turns that into a concrete number.
“Slot tricks” fact-checked
| Claim | Reality |
|---|---|
| “Slots pay better at night / on the hour” | The RNG has no clock |
| “After a jackpot a machine pays nothing for ages” | Every spin is independent – even right after a jackpot |
| “Changing stakes outsmarts the cycle” | There is no cycle |
| “Machines near the entrance pay better” | Meaningless online, debunked in modern casinos |
| “Bonus buys are always worth it” | Usually same or marginally different RTP – at massively higher variance |
The only real “trick” is inconvenient: lower stakes, higher RTP, European over American roulette – and demos instead of real money if all you want is the feel of the game.
FAQ
Are demo slots rigged to win more often? Not with reputable manufacturers – demo and real-money versions run on the same certified engine with identical RTP. That’s what makes demos the most honest test lab.
Can a casino change the RTP? Manufacturers offer some slots in multiple RTP variants (e.g. 96% / 94% / 92%); the casino picks one. Always worth checking the game info at the casino. Our data sheets state the manufacturer’s standard version.
How do I recognize a fair slot? Licensed operator, certified manufacturer (Pragmatic Play, Play’n GO, NetEnt …), RTP visible in the game info. No RTP shown at all: walk away.