Play'n GO · High volatility
Play'n GO's cult cluster-pays slot full of one-eyed aliens. Here's how its chain of quantum features pays.
Updated June 2026 · tested by our review team
Reactoonz (Play'n GO, 96.51% RTP, high volatility, 4,570x stake max win) is available off GamStop at non-UK casinos. Read our full verdict, the game's real stats and a breakdown of how its features pay below.
| Developer | Play'n GO |
|---|---|
| RTP | 96.51% (operators also run 94.51% / 92.52%) |
| Volatility | High |
| Max win | 4,570x stake |
| Reels / layout | 7×7 grid, cluster pays |
| Min / max bet | £0.20 — £100 per spin |
| Features | Quantum charges, Gargantoon wild, cascading reactions |
| Released | 2017 |
Our verdict
Reactoonz is a busy, addictive 7×7 cluster-pays grid where five or more matching aliens pay and vanish, dropping new symbols in. What sets it apart is the layered quantum feature system that builds with every cascade.
Matching symbols charge up four different quantum effects that add wilds and destroy symbols, and a charge meter eventually unleashes the giant Gargantoon wild. The interplay keeps even non-winning spins eventful — and at high volatility with a 4,570x cap, the payoffs can be sizeable.
High-ceiling games reward patience, not chasing. Whatever you play, set a budget first and stake at a level your bankroll can absorb. New to these sites? Start with our slots not on GamStop guide or our non UK casino reviews.
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FAQ
Yes — Reactoonz is available at casinos licensed outside the UK that are not part of the GamStop network, so a GamStop self-exclusion will not block access. However, if you self-excluded because of gambling harm, we strongly recommend you keep that exclusion and seek support from GamCare rather than seeking out non-UK sites.
The default RTP of Reactoonz is 96.51% (operators also run 94.51% / 92.52%). It is always worth checking the game's information panel before you play, as some operators run lower-RTP builds of the same game.
Yes. Reactoonz is a high-volatility slot, so wins are less frequent but can be much larger. It suits players comfortable with longer dry spells in pursuit of the bonus features.
The Gargantoon is the game's top feature wild. You build toward it by charging the meter through winning cascades; when it's full, a giant 3×3 wild lands and then splits into smaller wilds across subsequent cascades, often setting up the game's biggest clusters.