Reactoonz Slot Sites: Top Picks to Play Online in the UK
Written By Jamie Smith
Reactoonz is a casino classic, but with new slots coming out all the time it can be difficult for older releases to continue to find fans. This cluster pays slot dates back to 2017 but is often listed among the most popular slots at UK online casinos to this day, thanks to its chained wins and slot features like various bonus games.
The top Reactoonz casinos boast rapid payouts, while the cashiers offer a wide range of different payment methods that can be used, each with different min/max limits in place.
Best Reactoonz Casino Sites for 2026
| Position | Casino test reports | Rating | Bonus | Special features | Payout rate | Payout duration | Casino Games | To the provider | General terms and conditions |
|---|---|---|---|---|---|---|---|---|---|
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| 1 | Duelz | 5.0/5 | Up to 140 Free Spins When You Deposit £25 |
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| 2 | Grand Ivy | 4.9/5 | Bet & Get 75 Free Spins when betting £10 |
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| 3 | Casimba | 4.8/5 | Bet & Get 50 Free Spins When Betting £10 |
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| 4 | Mr Vegas | 4.8/5 | 100% up to £200 Welcome Bonus |
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96.50% | 1 - 2 days | 1500+ | Claim Your Bonus! | Full T&Cs Apply. 18+ New players only | Deposit & wager at least £10 to get free spins | Free Spins winnings are cash | No max cash out | Eligibility is restricted for suspected abuse | Skrill deposits excluded | Free Spins value £0.20 per spin | Free Spins expire in 48 hours | Gamble Responsibly | BeGambleAware.org |
Our full Reactoonz review covers everything potential players need to know, from the slot symbols on the paytable to the bonus rounds and everything in between. Read on for more.
Overview of the Reactoonz Slot Game
Reactoonz in Brief:
- Release Date: October 2017
- Type: Video Slot
- Theme: Creatures, Sci-Fi
- Software Studio: Play’n GO
- RTP: 96.51%
- Volatility: High
- Special Features: Quantum Leap Meter
- Bonus Rounds: Implosion, Alteration, Demolition, Incision, Gargantuan
- How to Trigger Bonus Round: Quantum Leap bonus features awarded for every 25 symbols cleared
Reactoonz has long-lasting appeal, with the game one of the first really successful cluster pays slots to be released, paving the way for the mechanic to become extremely popular. The game has a simple design with the cute alien characters exploding as the cluster pays mechanic gets triggered, with the different bonus features triggering as the meter fills.
More About Online Slots
Full Rules & Information About the Reactoonz Online Slot
Gameplay on the Reactoonz slot by Play’n GO unfolds over a 7×7 grid of reels, which offers a bigger surface area than most new slots have to offer. Players need to get at least five touching matching symbols for them to explode and allow new icons to cascade down.
Reactoonz Factsheet
| Reels | 7 |
| Rows | 7 |
| Paylines | Cluster Pays |
| Multipliers | Yes |
| Gamble Feature | No |
| Free Spins | No |
| Bonus Games | Yes |
| Jackpot | No |
| Min Bet | £0.20 |
| Max Bet | £5 |
There are no multipliers in the base game, while jackpots and free spins games are missing too and bonus rounds are lacking too even though there are various special features that can be triggered in the base game.
Reactoonz Symbols & Payouts
The game’s lower-paying symbols are coloured blobs, while more characterful aliens make up the higher-paying symbols on the game. The more of the same symbol that gets matched in a round of the Reactoonz slot game, the higher the potential payout players can look forward to receiving.
- All symbols: 8
- Highest-Paying Symbol: Purple Alien
- Wilds: Only in bonus feature
- Paylines Pay: Cluster Pays
- Maximum Win: 1,200x the stake size
Reactoonz Bonuses & Features
Each cascading win on Reactoonz helps to fill the meter located on the right-hand side of the reels. Getting 25 symbols cleared from the 7×7 reels means that one of the bonus features will be triggered and they can be queued up as well.
The Implosion bonus feature on Reactoonz explodes nearby symbols as well as adding between three and six wilds to the reels. Demolition, as the name of this bonus suggests, is an explosive slot feature on Reactoonz that blasts all one-eyed symbols from the reels.
Incision puts a wild in the central spot on the reels and places matching symbols diagonally in both directions, while alteration is a switching bonus feature that changes symbols to help set up combinations.
Whenever there are four matching symbols forming a square on Reactoonz, they automatically combine to form Giantoonz symbols, which has a 2x multiplier attached to any wins it helps to create.
Lastly, filling all of the five different bonuses in the quantum meter to the right of the reels will award the main Gargantoon feature. Here, the Gargantoon adds a giant 3×3 wild symbol to the reels, then between each cascade that follows it splits to create individual wild icons. This is where the main chained wins can appear on the Reactoonz slot game.
Similar Games & Best Alternatives
Players who enjoy the cascading reels element of Reactoonz should have a go on similar slots with the same mechanic, with the best of them including Rainbow Riches and Gates of Olympus.
Other Play’n GO slots worthy of attention along with Reactoonz include hits such as Book of Dead, Shamrock Miner and Sticky Joker.
Still A Casino Classic
Reactoonz is an everlasting casino classic for a reason, with Play’n GO crafting one of the first hit cluster pays games with plenty of bonus features included, even if there is not a free spins bonus game, which is a shame.
The main Gargantoon feature is a particular highlight, which can lead to higher potential payouts. Reactoonz remains one of the top slots to play at UK online casinos, despite its age.