Covers the classics people search for by name, the Scandinavian studios, and the slots that make a budget last.
Updated
This page carries figures checked on the date above, and that window has now passed. Studios publish new RTP settings and casinos change their rules: re-check the sources at the foot of the page.
Reactoonz doesn't have a free spins round. That's the first thing to know. Play'n GO built the whole game around what happens on a normal spin instead: a 7x7 grid of small aliens, cascades, a charge meter, and a giant alien called the Gargantoon who shows up when the meter fills.
It came out in October 2017 and scores 7.4 on our Spin Score. The base game gets a 9 from our editors. Only its own sequel matches that among the 105 slots we score. The free-spins factor gets a 6, because the chain of features stands in for a round.
The other thing to know is the RTP ladder. Five settings, from 96.51% down to 84.51%.
At a glance
Best for
Players who want something happening on most spins
The catch
Five RTP settings, and no free spins round at all
The bonus
Quantum meter features and the Gargantoon chain
Grid
7x7, clusters of five or more pay
Check before you spin
The RTP figure in the game's info screen
Play instead if...
You want proper free spins on a cluster grid: Jammin' Jars
Slots that share what makes Reactoonz what it is, in Spin Score order, at most two per provider. Reactoonz itself is scored in the spec sheet above. Spin Score = 40% RTP, 15% max win, 30% free spins round, 15% base game. How we score
The natural next step for a Reactoonz player: an 8x8 cascading cluster grid where five or more fruits pay, plus the free spins round Reactoonz lacks. Jam Jar wilds move around the grid and their multipliers grow each time they join a win. It scores 8.5, lifted by a 96.83% top RTP and Push Gaming's highest observed win of 19,998.5x, the studio's record of the biggest win seen, not a stated cap. A second 94.25% setting exists. High volatility, same as Reactoonz.
How the score breaks down, and the fine print
Return to playerData · 40%9.5
Max winData · 15%8.4
Free spins roundEditors · 30%8.0
Base gameEditors · 15%7.0
What it is: An 8x8 cascading cluster-pays grid where clusters of five or more fruits pay and Jam Jar wilds carry growing multipliers.
Free spins round: Jam Jar wilds move around the grid in free spins and their multipliers grow with each win they join.
Base game: Cascades and the random Rainbow feature with giant fruits add action between bonuses.
RTP, volatility and max win as Push Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Same score as the original, 8.5, reached a different way. The sequel's RTP is lower (96.4% top, 94.4% alternative) but its free spins lead into the Giga Jar, a large instant-prize block whose level rises each time it returns. That earns a 9 for the bonus. Push Gaming's highest observed win is 50,000x. Gold Vinyl collection and Fruit Blast keep the base game busy, though not quite Reactoonz-busy.
How the score breaks down, and the fine print
Return to playerData · 40%8.2
Max winData · 15%10.0
Free spins roundEditors · 30%9.0
Base gameEditors · 15%7.0
What it is: An 8x8 cluster-pays sequel where fruits pay in clusters of five or more, with instant prize tiles, wild jars and the Giga Jar feature.
Free spins round: Free spins lead into the Giga Jar feature, a large instant prize block with jar multipliers that boosts its level each time it returns.
Base game: Gold Vinyl collection, instant prizes and random Fruit Blast give the base game regular events.
RTP, volatility and max win as Push Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Not a cluster game in the strict sense: it's scatter pays on a 6x6 grid. It ranks here for its bonus, a 10 out of 10, the Money Cart hold-and-win round with more than 20 features in play. Relax lists a 150,000x max win. The catch is serious. Volatility is 5 out of 5 on Relax's scale per SlotCatalog, the top bet is only 6, and Relax lists a UK game ID ending in 92, which points to a 92% version there.
How the score breaks down, and the fine print
Return to playerData · 40%7.3
Max winData · 15%10.0
Free spins roundEditors · 30%10.0
Base gameEditors · 15%6.0
What it is: A scatter-pays slot that ends the Money Train series, with a Money Cart hold-and-win bonus starting on 6x4 and unlocking more rows.
Free spins round: The final Money Cart bonus adds the Arms Dealer, Upgrader, Unlocker and Reset, with more than 20 features in play.
Base game: A base game respin feature and the Arms Dealer, who can hand out features at any time, add some base action.
RTP, volatility and max win as Relax Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Pay-anywhere wins on a 6x5 grid with tumbles, and random multiplier symbols up to 1,000x that can land on any spin. Fifteen free spins add a running total multiplier. It scores 8.0. Pragmatic leaves the RTP to the casino, from 96.5% down to 94.5% per Bigwinboard, so the same check applies as with Reactoonz. Max win is 15,000x. The base game is busy, but it's a different kind of busy: multipliers rather than grid-changing features.
How the score breaks down, and the fine print
Return to playerData · 40%8.5
Max winData · 15%7.9
Free spins roundEditors · 30%8.0
Base gameEditors · 15%7.0
What it is: A 6x5 pay-anywhere grid with tumbles and multiplier symbols worth up to 1,000x. Four or more scatters start 15 free spins with a running multiplier.
Free spins round: Fifteen free spins with a running total multiplier fed by multiplier symbols up to 1,000x, plus five more spins for three scatters.
Base game: Tumbles and random multiplier symbols from 2x to 1,000x can land on any base spin.
RTP, volatility and max win as Pragmatic Play publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Play'n GO's other big cascade grid, and the closest relative on this list. A 5x5 board where matches pay and a multiplier rises with each drop, three princess powers that reshape the grid, and a Trinity respin. Unlike Reactoonz, clearing the grid gives free spins where you pick the spin count and which princess helps. Score 7.9. Same studio habit, though: five settings, 96.5% down to 84.5%, per Bigwinboard. Max win 5,000x.
How the score breaks down, and the fine print
Return to playerData · 40%8.5
Max winData · 15%6.0
Free spins roundEditors · 30%8.0
Base gameEditors · 15%8.0
What it is: A 5x5 cascading grid slot where matching symbols pay, a multiplier rises with each drop and three princesses alter the grid.
Free spins round: Clearing the grid gives free spins with a growing multiplier, and you choose the spin count and which princess power helps.
Base game: Cascading wins raise a multiplier, and three princess powers plus the Trinity respin fire in the base game.
RTP, volatility and max win as Play'n GO publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Also a 7x7 cluster grid, and the free spins are the reason it scores 7.9. Winning symbols mark their spots, further wins on marked spots add multipliers that double up to 128x, and in the 10 to 30 free spins those marks stay for the whole round. In the base game they reset after each spin. Very high volatility, 5,000x max win, and three RTP settings from 96.5% to 94.5%. A 100x bonus buy exists where allowed; I'd skip it.
How the score breaks down, and the fine print
Return to playerData · 40%8.5
Max winData · 15%6.0
Free spins roundEditors · 30%9.0
Base gameEditors · 15%6.0
What it is: A 7x7 cluster pays grid with tumbles. Winning symbols mark their spots, and further wins on marked spots add multipliers from 2x doubling up to 128x.
Free spins round: Ten to 30 free spins where marked grid spots and their doubling multipliers (up to 128x) stay for the whole round, so value builds spin after spin.
Base game: Tumbles and spot multipliers can build within a single base spin, though they reset after it.
RTP, volatility and max win as Pragmatic Play publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Demo buttons open the free-play version on the game studio’s own site: no deposit, no account. We are not paid for them. How we make money
How Reactoonz plays
The grid is 7x7. A group of five or more matching aliens touching each other pays, then vanishes, and new aliens drop in. Chains are common. Bets run from 0.20 to 100 per spin, according to SlotCatalog.
On top of the cascades, two things run all the time. Random Instability can drop wilds onto the grid. And every cluster you clear charges the Quantum meter.
Our editors score the base game a 9, for a simple reason: on most spins something moves, charges or explodes. If you've found classic line slots boring, this is the opposite.
Quantum features and the Gargantoon
This is the bonus. As the meter charges, it unlocks Quantum features that change the grid, and when it's fully charged the Gargantoon arrives. The full charge sets off up to five grid-changing features in sequence.
It's a good idea. It's also short. A free spins round gives you a run of spins to build something; this gives you one chain on one spin. That's why we score it 6, not 8.
The max win is 4,570x your stake, according to SlotCatalog. Play'n GO's own page doesn't list it. SlotCatalog rates volatility 10 out of 10, so most of the big results come from the meter filling and the Gargantoon landing well, and that doesn't happen often.
RTP settings: check before you play
SlotCatalog lists five settings: 96.51%, 94.51%, 91.49%, 87.50% and 84.51%. The casino chooses. Play'n GO's game page lists no RTP at all, which is why we rely on SlotCatalog here; we couldn't locate a Bigwinboard review for this title.
At the top setting the house keeps about 3.49% of stakes over the long run. At the bottom, about 15.49%. Same aliens, same grid. Our Spin Score uses the top setting and gives 7.4. The same formula at 94.51% gives about 5.0, and at 84.51% about 4.4.
Open the menu, find the game rules, and look for the stated return. If it isn't 96.51%, you're on a lower version. Our RTP guide explains why this matters more than any feature. And no setting makes a slot a good bet: every one of them has a negative expected value.
Who it suits
Players who get bored waiting. Reactoonz front-loads the action into the base game, so there's rarely a long stretch of nothing on screen, even if the balance is drifting down.
It suits less well if you like the shape of a classic bonus: trigger, a round of spins, a total at the end. That just isn't here. And high volatility means a budget can still drain fast between good meter charges.
The slots above are cluster, cascade and pay-anywhere games, ordered by Spin Score. All six have a real free spins round, which is mostly why they outscore Reactoonz. Moon Princess is the closest in feel and comes from the same studio. Jammin' Jars is the one I'd try first. Money Train 4 is only loosely related and much harsher on a budget. More from the studio on the Play'n GO page.
Frequently asked questions
What is the RTP of Reactoonz?
The highest setting is 96.51%. SlotCatalog lists four lower ones: 94.51%, 91.49%, 87.50% and 84.51%. Check the game's info screen to see which one the casino runs.
Does Reactoonz have free spins?
No. The Quantum meter and the Gargantoon chain replace a free spins round.
What is the max win on Reactoonz?
4,570x your stake, according to SlotCatalog. Play'n GO's game page doesn't list a figure.
How does the Gargantoon work?
Clearing clusters charges the Quantum meter. Fully charged, it brings in the Gargantoon and sets off up to five grid-changing features in sequence.
Is Reactoonz high volatility?
Yes. SlotCatalog rates it 10 out of 10. The busy base game hides that well, so set a budget first.
Further reading
Official sources
Play'n GO: Reactoonz– Release date, game features and the official demo launcher, checked November 3, 2026
SlotCatalog: Reactoonz– RTP settings 96.51/94.51/91.49/87.50/84.51%, max win 4,570x, volatility 10/10, bets 0.2-100, 7x7 grid, checked November 3, 2026
Push Gaming: Jammin' Jars– RTP 96.83% and 94.25%, highest observed win 19,998.5x, checked November 3, 2026
