Slots, explained properly.
Every game's RTP, volatility and max win, checked against the provider's own figures. Every feature taken apart. Every Great Britain rule in plain English. And the maths nobody else puts on the front page: every slot costs you money on average, and we show you exactly how much.
5 Lions Megaways by Pragmatic Play: RTP 96.50%, volatility High (launch release: 'highly volatile'), max win 5,000×.
5 Lions Megaways by Pragmatic Play
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All guidesHow Slots Work: What Actually Decides Each Spin
How a modern slot decides a result: the random number generator picks the outcome, the reels only display it, and the paytable and house edge do the rest.
The mathsRTP Explained: What Return to Player Means in Slots
What RTP means in slots, how theoretical return differs from what you get in one session, why one game can come in several RTPs, and how to find it.
The mathsSlot Volatility Explained: High vs Low Variance Slots
Slot volatility describes how a game's returns are spread: small and frequent or rare and large. How it differs from RTP, with an illustrative example.
MechanicsPaylines vs Ways to Win: How Slot Wins Are Counted
Paylines, 243 and 1,024 ways, Megaways, cluster pays and pay anywhere explained: how each slot layout decides which symbols form a winning combination.
Under the hoodRandom Number Generators in Slots: How the RNG Works
What a slot RNG is, how pseudo-random numbers are seeded and mapped to reels, how virtual reels work, how games are tested, and why a slot is never due.
JackpotsSlot Jackpots Explained: Progressive, Fixed and Must-Drop
How slot jackpots work: networked and local progressives, fixed jackpots and must-drop or daily jackpots, why contributions lower base RTP, and the odds.
The Great Britain rules, at a glance
All the rulesMaximum stake per spin
£2 if you are 18 to 24. In force since April and May 2025.
2.5 sMinimum spin time
No autoplay, no turbo, no slam stops. Since 31 October 2021.
10×Wagering cap on bonuses
And no mixed sport-and-casino offers. Since 19 January 2026.
18+Verified before you play
Even free demo games. Since 7 May 2019.
Highest published RTP in the library
Sort the full tableRanked by the provider's own default figure. Higher RTP means a smaller average cost, not a better chance of a big win. Casinos can run lower versions, so check the game's info screen.
| Game | Provider | RTP | Cost per £100 staked | Max win |
|---|---|---|---|---|
| Mystery Reels Megaways | Red Tiger | 98.06% | £1.94 | 10,346× |
| Blood Suckers | NetEnt | 98.00% | £2.00 | 900× |
| Big Bad Wolf | Quickspin | 97.34% | £2.66 | 1,225× |
| Hotline | NetEnt | 97.04% | £2.96 | 1,200× |
| Wild Swarm | Push Gaming | 97.03% | £2.97 | 3,069× |
| Queen of Riches | Big Time Gaming | 96.90% | £3.10 | 77,800× |
| Immortal Romance | Games Global | 96.86% | £3.14 | 12,150× |
| Gemix | Play'n GO | 96.83% | £3.17 | 4,557.3× |
How the features work
All featuresNewest in the library
All slotsWork it out yourself
All toolsWhat will an hour cost?
Stake, spins and RTP in; the expected cost out. Includes the 1,440-spins-an-hour ceiling.
SimulatorSame RTP, different ride
Run 1,000 sessions of a low and a high volatility game and watch the spread.
CheckerYour stake limit
Enter your date of birth to see the maximum online slot stake that applies to you.