With superb graphics, a hatful of fun features and a 4,570 max win, Play’n GO’s Reactoonz slot is one of the most recognisable and playable casino games online.

Why play Reactoonz

Iconic design & gameplay

Non-stop action

4,570 max win

What we think of Reactoonz

“Phone game meets slot with spectacular results – I never get tired of Reactoonz.”

Is Reactoonz the right slot for you?

I must have played thousands of online slots in the last few years and when a Cluster Pays slot comes along, it’s always a fun break from traditional reels and paylines.

Instead of reels, Reactoonz is played on a 7x7 grid. You make winning combos when 5 or more of the same symbols are connected in a cluster. As well as the Cluster Pays format, it also has cascading symbol drops which create the kind of chain reactions suggested by the slot’s name. Winning symbols are removed from the grid so that new symbols can drop down, generating more chances to win from the same go.

Reactoonz Slot Screenshot

Every time you spin a win, you charge up the Quantum Leap meters below the reels. If you can fully charge up the meter in the same go, you’ll randomly trigger one of the quantum features I discuss later in this Reactoonz slot review.

This meter-powered format makes Reactoonz an all-action slot. In my opinion, Cluster Pays slots deserve a place in any player’s game mix, and Reactoonz is arguably the top slot in that category.


Reactoonz has none of the usual Free Spins and other features you’ll find on your average slot game, but then Reactoonz isn’t your average slot.

If you can string together enough reactions in the same game, you’ll charge the meter and unleash one of these fun features.

Meter modifiers

  • Implosion: When triggered, 3 to 6 symbols are turned into wilds and all adjacent symbols are destroyed.
  • Alternation: A randomly chosen low-value symbol is transformed into a different symbol. However, if you don’t have any low-value symbols on the grid, a high-value alien will be randomly selected instead. This feature is sure to get some extraterrestrial adrenaline pumping.
  • Demotion: All low-value symbols are destroyed and removed from the grid. Yep, it’s a good ‘un!
  • Incision: A wild is put into the centre which creates 2 intersecting diagonal lines. It will then show the same randomly picked symbol.

Reactoonz Slot Screenshot


This special feature is triggered in the Reactoonz slot game when all 5 meters are fully charged. The Gargantoon adds a 3x3 wild randomly onto the grid and with each cascade, it divides to become two 2x2 wilds. During the cascade, the Gargantoon divides again into nine 1x1 wilds. If you don’t win, 1 quantum feature is triggered at random.


If you have a non-winning spin in the Gargantoon feature, the Instability feature is triggered, which means the Gargantoon can randomly drop between 4 to 8 wild symbols. This Reactoonz feature helps you land more winning combinations. You gotta love that.


This is triggered when 4 matching symbols adjacent to each other in a 2x2 shape appear. This Reactoonz game feature means that all wins are doubled in any winning combination.


One randomly selected low-value symbol will be marked as the Fluctuating symbol during each spin. If it appears as part of a winning combination, it will leave 2 wilds behind on the grid.

What the provider says

“Reactoonz is a playful parallel universe charged with stellar power. The series has become one of the best-loved grid slots around the world.”

Play’n GO

Other games like this

If you like this style of slot, you’ll be pleased to know that Reactoonz slot is just one in a 5-game ‘oonz’ series from Play’n GO that includes Energoonz, Dr Toonz, Gigantoonz and Reactoonz 2. They’re all great examples of grid slots, but there are many others to get your teeth into, including the iconic Sweet Bonanza.

Reactoonz 2

Three years after the release of the original came the sequel, the Reactoonz 2 slot. Again, we get a 7x7 grid with Cluster Pays and cascading symbols. The key addition is a new set of features and reel modifiers and a third level-up meter.

Sweet Bonanza

Pragmatic Play’s 2019 smash hit is another grid game with mobile game app DNA but this time, symbols don’t have to be connected in clusters, they can appear anywhere on the reels. Unlike Reactoons games, Sweet Bonanza online slot has a Free Spins bonus feature with candy bomb multipliers, plus a much higher 21,000X max win.

My verdict

Between its extra-terrestrial features, super gamey graphics and edge-of-your-seat volatility, Reactoonz is a truly unique slot. Create your PlayOJO account in seconds and try it for free!

If you'd like to play Reactoonz or any of PlayOJO’s vast slots collection, sign up and you’ll also get free spins on a top slot when you make your 1st deposit, with no wagering requirements (terms apply).


What’s the difference between this Reactoonz online slot and Reactoonz 2?

The original Reactoonz slot has 2 level-up meters and 8 bonus features and a 4,570X max win. Reactoonz 2 has 3 level-up meters, even more features and a 5,083X top prize.

What is the Reactoonz RTP?

With a 91.49% RTP, Reactoonz is one of the lower RTP slots online. However, during a session of hundreds of thousands of spins, Reactoonz’ volatility is a much more important factor in payouts than its RTP. If you play the Reactoonz UK slot at PlayOJO, you’ll also get money back on every spin with OJOplus, our real time, real cash rewards.

Can I play Reactoonz slots for free?

Reactoonz and Reactoonz 2 are particularly complex slots, so it’s handy that PlayOJO has Reactoonz demo versions so you can experience as much Reactoonz free play as you like before you play for real. Simply create your PlayOJO account, search for Reactoonz and choose Try for Free.