Slots make up over 70% of games at an online casino. Yet most players are unaware of the two fundamental concepts that shape their experience: RTP (return to player) and volatility.
Understanding these two ideas will let you pick slots that match your playing style and your bankroll. In this guide, we break it all down with concrete examples on Slott, Celsius and RingoSpin.
1. What is RTP?
The RTP (Return to Player) is the percentage of wagered money that a slot machine pays back to players over the long run. The higher it is, the more "generous" the machine.
- 96% RTP: out of €100 wagered, the machine returns €96 on average (it keeps €4)
- 98% RTP: out of €100 wagered, €98 is returned (it keeps €2)
Careful: RTP is calculated over millions of spins. In a session of 100 spins, anything can happen — that's variance. But over the long term, a 98% RTP slot will cost you less than a 92% one.
On Slott, each slot's RTP is shown directly in the game menu. On Celsius, you'll find it in the game rules (the "i" icon). RingoSpin shows the RTP in each slot's description.
2. Volatility: low, medium, high
Volatility (or variance) indicates how often and how much a slot pays out.
🟢 Low volatility
Frequent but small wins. Ideal for beginners and those who want to play for a long time with a small bankroll. Sessions are predictable, with few big swings.
Ex: Starburst (RTP 96.1%), Blood Suckers (RTP 98%)🟡 Medium volatility
Balance between frequency and size of wins. The best compromise for most players. You can expect decent wins without draining your bankroll in 10 spins.
Ex: Book of Dead (RTP 96.2%), Gonzo's Quest (RTP 96%)🔴 High volatility
Rare but potentially huge wins. For players who love risk and have a solid bankroll. You might go 50 spins without winning anything, then land a x5000.
Ex: Gates of Olympus (RTP 96.5%), Sweet Bonanza (RTP 96.5%)3. How to choose based on your profile
| Your profile | Ideal volatility | Minimum RTP | Recommended stake |
|---|---|---|---|
| Beginner — small budget, wants fun | Low | 96%+ | €0.10–€0.50/spin |
| Regular player — medium bankroll, wants fun + wins | Medium | 96%+ | €0.50–€2/spin |
| High roller — big budget, chasing the big win | High | 95%+ | €2–€10/spin |
| Clearing a bonus — needs to meet wagering | Low | 97%+ | €0.20–€1/spin |
4. Top 10 slots with the best RTP
Here are the slots with the highest RTPs, available on Slott, Celsius and RingoSpin:
| Slot | Provider | RTP | Volatility | Max win |
|---|---|---|---|---|
| Blood Suckers | NetEnt | 98.0% | Low | x1014 |
| Starmania | NextGen | 97.9% | Medium | x1000 |
| White Rabbit | Big Time Gaming | 97.7% | Medium | x17000 |
| 1429 Uncharted Seas | Thunderkick | 98.6% | Medium | x670 |
| Jokerizer | Yggdrasil | 98.0% | Medium | x1060 |
| Gates of Olympus | Pragmatic Play | 96.5% | High | x5000 |
| Sweet Bonanza | Pragmatic Play | 96.5% | High | x21100 |
| Book of Dead | Play'n GO | 96.2% | Medium | x5000 |
| Starburst | NetEnt | 96.1% | Low | x500 |
| Big Bass Bonanza | Pragmatic Play | 96.7% | Medium | x2100 |
5. Strategies and tips
Strategy for clearing a wagering requirement
When you need to wager €1,200 to unlock a bonus, favour:
- Low-volatility slots (frequent wins = stable bankroll)
- A high RTP (97% minimum)
- A low stake (€0.20–€0.50) to maximise your number of spins
- Avoid bonus buys — they don't always count towards wagering
Strategy for chasing the big win
If you're after a memorable stroke of luck:
- Choose high-volatility slots (Gates of Olympus, Sweet Bonanza)
- With a high max win (x5000+)
- Moderate stake (€1–€2) — enough to make the max win worthwhile
- Set yourself a loss limit and stick to it
Never play a slot without checking its RTP. Some versions of the same slot have different RTPs depending on the casino (e.g. Book of Dead can be at 96.2% or 94.2%). On Slott, Celsius and RingoSpin, the RTP shown is always the highest.
6. Where to play the best slots?
All our partner casinos offer the most popular slots with the highest RTPs:
- Slott — 800+ slots, exclusive mini-games, RTP shown in-game
- Celsius — 500+ slots, new releases every week, free demo mode
- RingoSpin — 600+ slots, weekly slot tournaments with a prize pool
🎰 Ready to try these slots?
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