Reactoonz is the slot that made cluster pays mainstream. Play’n GO released it in 2017, and its cheerful little aliens, chain reactions and screen-clearing features have earned it a place among the most played slots in the UK. Instead of reels and paylines, you play on a 7 x 7 grid where groups of matching symbols explode and make room for new ones. In this Reactoonz slot review we explain how the game works, what the Quantum features and the Gargantoon do and what you can expect from the RTP and volatility.
Reactoonz at a Glance
| Feature | Details |
|---|---|
| Provider | Play’n GO |
| Release | 2017 |
| Grid | 7 x 7 |
| How you win | Clusters of 5 or more matching symbols |
| RTP | 96.51% (casinos may use a lower setting) |
| Volatility | High |
| Maximum win | 4,570x your stake |
| Stake in the UK | From £0.20 up to the £5 per spin limit (£2 for players aged 18 to 24) |
A World of Little Aliens
The symbols in Reactoonz are colourful aliens, called Reactoonz, each with their own look and animation. There are single-eyed aliens that pay less and two-eyed aliens that pay more. Two special characters, the Energoon and the Gargantoon, play a key role in the bigger features. The bright, cartoon-like style and playful sounds make the game feel light, even though the volatility is high.
How to Play Reactoonz
Reactoonz uses cluster pays. A win forms when five or more identical symbols touch each other horizontally or vertically. The bigger the cluster, the bigger the win. You only choose your stake per round.
After each win, the winning symbols disappear and new symbols drop into the empty spaces. This cascade can create a new cluster, and the chain continues until no new wins form. One round can therefore produce a whole series of wins.
The Energoon Wild
The Energoon is a wild that appears when a cluster of one-eyed aliens is removed. It substitutes for all symbols, and after it is part of a win, it transforms the symbols around it into the same type before exploding. This can create new clusters straight away and keep the cascade going.
Quantum Features
At the side of the grid is the Quantumeter. Every symbol that explodes in a cascade fills the meter. When it reaches certain levels, a Quantum feature starts:
| Feature | What it does |
|---|---|
| Implosion | Turns several random symbols into wilds |
| Incision | Draws a cross of wilds from a central wild |
| Demolition | Removes all one-eyed symbols from the grid |
| Alteration | Changes one symbol type into another to create bigger clusters |
After a Quantum feature, the meter continues filling. If it is filled completely, the Gargantoon arrives.
The Gargantoon
The Gargantoon is the biggest feature in the game. It appears as a 3 x 3 wild on the grid. After a win, it splits into two 2 x 2 wilds, and later into four single wilds. Each stage can create new wins, and combined with cascades, this is where the largest payouts in Reactoonz come from, including the maximum win of 4,570x your stake.
Fluctometer and Giant Clusters
The Fluctometer is a second meter that charges as you win with specific symbols. When it is full, an extra feature can start that adds wilds or creates larger clusters. Together, the two meters mean that a long cascade gets more rewarding the longer it lasts.
RTP, Volatility and Maximum Win
The standard RTP of Reactoonz is 96.51%. Play’n GO offers lower RTP versions as well, so the casino may use a different setting. Always check the game information.
The volatility is high. Many rounds end with small or no wins, and the big payouts depend on long cascades that fill the Quantumeter and trigger the Gargantoon. Give yourself enough budget for longer sessions.
Reactoonz on Mobile
Reactoonz works smoothly on iPhone, Android phones and tablets. The 7 x 7 grid fits well in portrait mode, and the meters remain easy to follow. See our guide to mobile slots in the UK for more tips.
Playing Reactoonz in the UK
At UK-licensed casinos, Reactoonz follows the rules of the UK Gambling Commission. There is no autoplay or turbo play, every round lasts at least 2.5 seconds and the maximum stake is £5 for players aged 25 and over, or £2 for players aged 18 to 24.
Reactoonz vs Other Cascading Slots
Cascades are now common in online slots. In Sweet Bonanza, symbols pay anywhere on the screen, while Megaways slots combine cascades with changing reels. Reactoonz stands out for its two meters, which reward long chain reactions with extra features instead of a classic free spins round. A sequel, Reactoonz 2, adds more features and a higher maximum win.
Who Is Reactoonz For?
Reactoonz suits players who like constant movement on the screen and features that build up during a round. If you enjoy watching chain reactions grow and do not mind longer stretches without a big win, it is one of the most entertaining slots around. Players who prefer a classic layout with paylines, a simple free spins round or a steady flow of wins may find it too unpredictable. In that case, a medium volatility slot with traditional reels is a calmer choice, while Reactoonz is the pick when you want something different.
Tips for Playing Reactoonz
- Expect dry spells: high volatility means the Gargantoon can take a while.
- Choose a sustainable stake: you need enough rounds to see the bigger features.
- Watch the meters: they show how close you are to the next feature.
- Check the RTP version: Play’n GO slots can run at lower RTPs at some casinos.
- Try the demo: learn the features before you play for real money.
Is Reactoonz Worth Playing?
Yes. Reactoonz is one of the most original slots of its generation, with constant action and features that build on each other. The high volatility will not suit everyone, but if you enjoy chain reactions and colourful design, it is a must-try.
Where to Play Reactoonz
Reactoonz is available at almost every UK casino that offers Play’n GO games. Compare the best UK online casinos, explore more games on our online slots page, and read our guide to gambling with real money before you deposit.
Play responsibly. Set a budget, take breaks and never chase losses. For support, visit BeGambleAware.org. 18+ only.
Features
Reactoonz FAQ
What is the RTP of Reactoonz?
The standard RTP is 96.51%. Play'n GO also offers lower versions, so check the game information at your casino.
How do you win in Reactoonz?
You win by forming clusters of five or more matching symbols that touch horizontally or vertically.
What is the Gargantoon?
The Gargantoon is a 3 x 3 wild that appears when the Quantumeter is full. It splits into smaller wilds after wins.
What is the maximum win on Reactoonz?
The maximum win is 4,570x your stake.
Does Reactoonz have free spins?
No. Instead of free spins, Reactoonz uses cascades, Quantum features and the Gargantoon.
