Play Demo
Reactoonz is one of the most important cluster pays slots ever released. Play’n GO’s 2017 original launched an entire franchise, inspired a generation of grid-based games, and still holds its own against sequels and imitators nearly a decade later.
The 7×7 grid is packed with goggle-eyed alien creatures in every colour imaginable, and the cascading win system feeds into a Quantum Leap meter that builds toward increasingly powerful modifiers. It looks like a mobile puzzle game. It plays like a volatile slot with a 4,570x cap and a habit of draining 50 credits before anything meaningful lands.
Wins form when five or more matching symbols connect horizontally or vertically on the 7×7 grid. Winning symbols are removed and new ones drop from above to fill the gaps, creating chain reactions. Each cascade can generate further clusters, and every winning symbol collected during a round feeds into the Quantum Leap meter on the left side of the screen. The round only ends when no new clusters form after a cascade.
Four matching symbols landing in a 2×2 square automatically merge into a single Giantoonz symbol. Any winning cluster that includes a Giantoonz pays double. These form naturally during play and don’t require any special trigger, though they appear less often than you’d expect on a grid this size.
Each spin randomly marks one of the four one-eyed (low-value) symbol types as the Fluctuating symbol. If any of these marked symbols form part of a winning cluster, they leave two wild symbols behind on the grid after being removed. The wilds substitute for all symbols and can chain into further cascades. Wilds can only appear through Fluctuation or Quantum Features, never naturally on a drop.
Every winning symbol collected during a round charges the Quantum Leap meter. After every 25 symbols collected, one random Quantum Feature is added to a queue. Up to four can be stacked. When no more winning clusters remain on the grid, the queued features fire in sequence. If a fifth charge is reached, the Gargantoon is added instead.
Four possible features are randomly assigned to the queue. Implosion transforms 3 to 6 symbols into wilds while destroying all adjacent symbols. Incision places a wild in the centre of the grid and creates two diagonal lines of a single random symbol. Demolition destroys all one-eyed symbols and their matching copies across the grid. Alteration picks one random one-eyed symbol type and transforms every instance into a different symbol.
The three-eyed creature sitting in its pod on the right side of the grid is the Gargantoon, and reaching it is the entire point of the Quantum Leap system. When activated, a 3×3 wild symbol drops onto the grid in a random position. After wins are calculated and no more cascades form, it splits into two 2×2 wilds placed randomly, and then finally into nine individual 1×1 wilds scattered across the grid. New symbols cascade down before each Gargantoon move, refilling the grid for maximum coverage. On any initial non-winning spin, there’s also a small chance (the Instability feature) for the Gargantoon to randomly drop 4 to 8 wilds onto the grid as a consolation.
Everything in Reactoonz happens in the base game. There are no free spins, no scatter triggers, no bonus buy options. The entire structure is built around cascading clusters feeding the Quantum Leap meter, which stores up features that fire when the cascades stop. That loop is the game. Stakes run from £0.20 to £100, and the 96.51% RTP (at the highest setting) applies across all bet levels. Play’n GO offers this slot at multiple RTP configurations, with some operators running versions as low as 84.51%. Check the in-game info tab to confirm which version you’re playing.
The 7×7 grid holds 49 symbol positions filled by eight alien character types. Four one-eyed creatures (the low pays) and four two-eyed creatures (the high pays) form the full set. There are no traditional paylines. Clusters of five or more identical symbols touching horizontally or vertically count as wins. Winning symbols vanish, new ones fall in, and the process repeats until nothing connects. Volatility is high, and the max win sits at 4,570x your stake.
These values are taken from a £1.00 bet level.
| Cluster Size | Pink (2-eye) | Green (2-eye) | Blue (2-eye) | Orange (2-eye) | Purple (1-eye) | Pink (1-eye) | Green (1-eye) | Yellow (1-eye) |
|---|---|---|---|---|---|---|---|---|
| 15+ | £750.00 | £300.00 | £150.00 | £75.00 | £10.00 | £10.00 | £3.00 | £3.00 |
| 12+ | £50.00 | £25.00 | £10.00 | £5.00 | £3.00 | £3.00 | £1.00 | £1.00 |
| 10+ | £20.00 | £10.00 | £5.00 | £3.00 | £1.00 | £1.00 | £0.80 | £0.80 |
| 9 | £8.00 | £4.00 | £3.00 | £2.00 | £0.80 | £0.80 | £0.60 | £0.60 |
| 8 | £5.00 | £3.00 | £2.00 | £1.50 | £0.60 | £0.60 | £0.30 | £0.30 |
| 7 | £3.00 | £2.00 | £1.00 | £1.00 | £0.40 | £0.40 | £0.20 | £0.20 |
| 6 | £2.00 | £1.00 | £0.80 | £0.70 | £0.20 | £0.20 | £0.15 | £0.15 |
| 5 | £1.00 | £0.80 | £0.60 | £0.50 | £0.15 | £0.15 | £0.10 | £0.10 |
Reactoonz is a game that inspires genuine affection and genuine frustration in equal measure. The Quantum Leap system is brilliantly designed, the cascading cluster format keeps every spin alive longer than it has any right to, and the Gargantoon payoff is one of the most satisfying feature conclusions in any slot. But the road to getting there can be punishing, and the 4,570x cap feels modest by modern standards.
The grid fills with colour the moment Reactoonz loads. Eight alien types in pink, green, blue, orange, purple, and yellow crowd a 7×7 board, each with its own face and expression. The two-eyed creatures (the premium symbols) have more detailed designs and sit slightly larger in their cells. The one-eyed low pays are simpler but no less characterful. On the right side of the grid, the Gargantoon sits in a glass pod like a museum exhibit, three eyes closed, waiting. The Quantum Leap meter on the left fills one notch at a time as winning symbols are collected. The whole visual setup communicates exactly what the game wants you to do: feed the meter, wake the creature.
Our review session was a slow bleed. Small clusters landed regularly enough to feel like the game was active, but returns were consistently below the bet level. Most hits came back at 0.10x to 0.55x, barely registering against a £1.00 stake. The Quantum Leap meter crawled upward. We burned through roughly 50 credits before the meter showed any meaningful progress, and even then, individual Quantum Features fired and cleared without producing much. The engaging quality is real, though. Each cascade that inches the meter forward feels like it matters, and you keep spinning because the next drop might be the one that chains into a full charge.
That tension between progress and payoff is what defines Reactoonz. The game never feels completely dead because the meter is always doing something, but it rarely feels generous either. When Quantum Features do fire, Demolition and Implosion tend to reshape the grid enough to trigger further cascades, which in turn charge more features. The loop can accelerate quickly from nothing into a screen full of wilds if the right sequence hits. Our session never reached the Gargantoon. The meter filled to three bars at its peak before the round ended with no new clusters, and progress reset entirely.
For a 2017 release, the production quality holds up. The alien characters bounce and squash when they form clusters, the cascading animations are smooth, and the soundtrack has that slightly off-kilter electronic quality that matches the space laboratory aesthetic. Play’n GO have revisited this franchise repeatedly with Reactoonz 2, Gigantoonz, Dr Toonz, Gargantoonz, and Reactoonz 100, but the original remains the most widely played entry in the series.
This is a slot you’ll either find compulsively watchable or quietly infuriating, and there’s no way to know which until you’ve sat with the demo for 100 spins in free play.
