Mega Joker slot

What is the Mega Joker slot machine?

Mega Joker is a classic slot from NetEnt, the Stockholm studio that has been part of Evolution since December 2020. It looks like an old casino fruit machine: cherries, lemons, oranges, plums, grapes, watermelons, bells, sevens, a treasure chest and the joker. The screen is split into two sets of reels. The lower set is the base game; the upper set is the Supermeter, a higher-stake mode you move into with a win.

Its fame comes from one number. Mega Joker is often listed as one of the highest-RTP slots online, with up to 99%. That figure is real, but it has strict conditions, and a player who doesn’t understand them may end up on a much lower return. Explaining those conditions is the main job of this page.

We use only the RTP, volatility, layout and jackpot details in our verified records. Where a detail depends on the casino’s version (coin values, bet levels), check the game’s help screen.

How Mega Joker plays: base game to Supermeter

The game is a two-stage loop. You play the lower reels at your chosen bet. When a spin wins, you choose whether to collect that win to your balance or transfer it into the Supermeter. The Supermeter then plays its own reels at a higher bet per spin, drawing from the transferred amount, and its wins build up in the Supermeter until you collect them or it runs out.

1. Set a coin value and bet level for the base reels.
2. Spin the lower 3 × 3 reels; wins are paid on the five lines.
3. After a win, choose Collect (to your balance) or move the win to the Supermeter.
4. In the Supermeter, choose a Supermeter bet; each spin is taken from the Supermeter total.
5. Supermeter wins are added to the Supermeter total, which you can collect at any point between spins.
6. When the Supermeter total is too small for another spin, the game returns to the base reels.

This structure is why Mega Joker feels more like a pub fruit machine than a modern video slot: it asks you to decide what to do with each win. In the UK each spin, in either mode, still takes at least 2.5 seconds, and there is no autoplay.

Mega Joker RTP: why 99% only applies at the top stake

The Mega Joker RTP is not one number. NetEnt designed the paytable so that higher bet levels, and use of the Supermeter, pay better than lower ones. The game reaches up to 99% only when you play the top stake level and send wins into the Supermeter. At lower bet levels the return is lower, and the help screen lists the figure for each. This is a rare case where betting max changes the RTP itself, not just the size of prizes.

The 96% and 92% rows are illustrations to show how much the bet level can matter, not Mega Joker’s official figures for particular stakes; the help screen gives those. Even at 99% the house still has an edge, and high volatility means the 1% average says almost nothing about a single session. Our explainer on RTP and the guide to RTP variants cover the general principle.

Mega Joker under UK stake limits

UK online slots now have a maximum stake per spin: £5 for players aged 25 and over since 9 April 2025, and £2 for players aged 18–24 since 21 May 2025, as set out in the Gambling Commission’s stake limit guidance (opens in a new tab). On Mega Joker this interacts with the RTP structure, because the best return depends on playing the top bet level.

If the top level at your casino’s coin value would cost more than your limit, the casino must stop you staking it, so you may not be able to reach the 99% setting. Whether you can depends on the coin values and bet levels in that casino’s version. Check the help screen, and read our page on the £2 stake limit for 18 to 24-year-olds for how casinos apply it.

Most people play far slower than the maximum speed. The point of the table is that a 1% edge on a large stake still adds up.

Mega Joker symbols, jokers and mystery wins

The symbols are the traditional fruit set, which our symbols hub traces back to early American machines. Cherries and lemons sit at the low end; bells, sevens and the treasure chest pay more. The joker is special: three on a line in the base game award a mystery win rather than a fixed prize, and in the Supermeter a joker can award a mystery prize too. The amounts depend on the bet and are shown in the paytable.

A mystery prize is still decided by the random number generator at the moment of the spin; the reveal is a display, not a choice the game makes afterwards. The Supermeter has its own paytable, with different symbols paying more than in the base game, which is part of how the higher RTP is built.

The Mega Joker progressive jackpot and max win

The Mega Joker max win is a random progressive jackpot rather than a fixed multiple. A share of each bet feeds the jackpot, which grows until it is won, and it can be won at random on a base-game spin. Because the prize changes all the time, there is no fixed max win figure to quote at £1, £2 or £5. The current amount is usually displayed on the game screen.

Progressive contributions are part of the published RTP: money that goes into the jackpot is returned to someone, eventually, but most players never see it. That is why a high RTP that includes a jackpot can feel lower in everyday play. Our page on how slot jackpots are funded explains the mechanics, and what happens when a jackpot is won covers the payout side.

Mega Joker volatility: high, despite the RTP

Mega Joker is rated high volatility. A high RTP and high volatility can sit together: the long-run return is generous, but it arrives unevenly, with many losing spins, occasional larger wins in the Supermeter and the rare jackpot. A £20 session can disappear quickly even at the 99% setting. Our explainer on volatility shows how variance and RTP are separate measures.

Mega Joker vs a UK pub fruit machine

Mega Joker borrows the look of a fruit machine but works under different rules. A pub machine in Great Britain is usually Category C, with a £1 maximum stake and a £100 maximum prize, and it can offer nudges and holds. Mega Joker is an online slot under the remote rules, with no nudges or holds and a progressive jackpot that is not capped at £100. Our comparison of slots and fruit machines covers the differences in more depth.

Slots similar to Mega Joker

Fire Joker from Play’n GO is the nearest modern cousin: 3 × 3, five lines, medium volatility, a 96.15% RTP and an 800x max win, without a Supermeter. Sizzling Hot Deluxe from Novomatic keeps the fruit theme on five reels. For other games with jackpots that grow, see Mega Fortune, another NetEnt progressive. Our fruit slots online page lists more.

Mega Joker myths and facts

• Myth: the 99% RTP applies whatever you bet. It applies only at the top stake with the Supermeter.
• Myth: a 99% game can’t lose much. High volatility means sessions swing widely; the 1% edge is a long-run average.
• Myth: the jackpot is due when it is large. Each spin has the same chance regardless of the jackpot’s size.
• Fact: the Supermeter is a choice. You decide whether to collect or transfer each base-game win.

How to check Mega Joker’s RTP and play the demo

1. Pass the casino’s age verification (required before any demo since May 2019).
2. Open Mega Joker and tap the menu or information button.
3. Find the RTP section; note the figure for each bet level and for the Supermeter.
4. Check which bet levels your stake limit allows.
5. Read the jackpot rules to see how it is won.

UK rules require games to make their rules and return available to players, under the Commission’s technical standard on game rules and likelihood of winning (opens in a new tab). A Mega Joker demo uses play money, so it is a safe way to learn the Supermeter decisions before staking real money.

Where to play Mega Joker in the UK

No partner offer is tied to Mega Joker, and progressive and classic titles are not in every lobby, so search the casino’s game list. Coral gives new players aged 18+ 100 free spins after they deposit and bet £10 on slots; the spins are worth 10p each on selected games and must be accepted within 48 hours. Ladbrokes gives up to 500 free spins, 50 a day for 10 days, after a £10 slots spend. PlayOJO’s 80 no-wagering spins (first deposit of £10 or more) are played on Big Bass Bonanza. Terms apply, including excluded payment methods.

Free spins from these offers are played on the selected games, not on Mega Joker. Keep play within a set budget, and for support contact GamCare (opens in a new tab) or the National Gambling Helpline on 0808 8020 133. More classic and modern games are in our slots hub.

18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: plan a slot budget. Free, confidential help: National Gambling Helpline 0808 8020 133.