Reactoonz Slot

Item: Reactoonz
Rating: 4.6

4.6/5

Published Date · Aug. 1, 2023 · Last Updated · Nov. 5, 2026

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Overview
How to play
Paytables & Symbols
Features
RTP & Volatility
Graphics & Audio
Mobile & App

Reactoonz Slot Review

Reactoonz is a Play'n GO grid slot with cluster pays on a 7x7 board, cascading wins and a Quantum Leap meter in place of a free spins round.

Reactoonz Slot Overview

A three-eyed alien dozes in a glass capsule beside the grid, and most of the game is about waking him up. Play'n GO released Reactoonz on 23 October 2017 as the follow-up to Energoonz, and it drops eight alien species onto a 7x7 grid where clusters of five or more pay. The cap on a single round is a max win of 4,570.30x your total bet.

Winning aliens vanish and new ones fall in from above, so one spin can pay several times before it ends. Each winning symbol also charges the Quantum Leap meter, which queues up to four grid-changing features and, on a fifth charge, sends in the Gargantoon as a 3x3 wild. You will not find free spins here. Every feature plays out inside the spin that set it off.

Volatility is high, and the default RTP is 96.51%, with four lower versions that casinos can pick instead.

Reactoonz Slot Details
Paylines	Cluster Pays
RTP	96.51%
Volatility	High
Jackpot	x
Minimum Bet	x
Maximum Bet	£5
Maximum Win	4,570.3 x
Software Provider	Play'n GO
Themes	Alien, Space
Design and Layout	7 Reel Slots, Wild Symbol
Features	Multiplier

Reactoonz packs a lot into one spin. Cascades keep running as marked aliens leave wilds behind, and the Quantum features queue up for their turn. If you enjoy watching a grid rebuild itself, you get plenty here, though free spins hunters will find no round to chase. The 84.51% version is the part we dislike most. For all that activity, the max win stops at 4,570.30x, a modest cap on a game this volatile.

4.6/5

Pros

Giantoonz double any winning cluster they join

Four Quantum features can reshape the grid mid-round

96.51% default RTP, above the 96.00% median of 392 slots we sampled in October 2026

One spin can pay several cascading clusters

Cons

Max win capped at 4,570.30x despite high volatility

Lower RTP versions run down to 84.51%

No free spins round or scatter symbol

How To Play Reactoonz Slot

Pick a total bet with the five stake buttons or the plus and minus keys under the grid, then press spin. Aliens drop onto the 7x7 grid, and any group of five or more matching symbols that touch horizontally or vertically pays, wherever it starts. The game removes the winning aliens, the rest fall, new ones fill the gaps from the top, and the cascade keeps running until no new cluster forms. UK rules cap each spin at £5, or £2 if you are 18 to 24.

Reactoonz Giantoon — A Giantoon doubles its cluster

Grid	Wins	Max Bet (UK)
7x7	Clusters of 5 or more	£5.00

Wilds never land on their own. Each one comes from a feature, and it stands in for every alien.

Reactoonz Slot Paytable & Symbols

Eight aliens pay, in the order Play'n GO's paytable lists them: four two-eyed aliens at the top and four one-eyed aliens below. Every value is a multiple of your total bet, and each column heading is a cluster size. The paytable groups the bigger clusters, so the 10 to 11 column covers clusters of 10 or 11, the 12 to 14 column clusters of 12 to 14, and 15+ any cluster of 15 or more. The pink alien leads the table at 750x for a cluster of 15 or more. The paytable lists no pay for the wild itself.

Name	5	6	7	8	9	10 to 11	12 to 14	15+
Pink Two-Eyed	1x	2x	3x	5x	8x	20x	50x	750x
Green Two-Eyed	0.80x	1x	2x	3x	4x	10x	25x	300x
Orange Two-Eyed	0.60x	0.80x	1x	2x	3x	5x	10x	150x
Blue Two-Eyed	0.50x	0.70x	1x	1.50x	2x	3x	5x	75x
Purple One-Eyed	0.15x	0.20x	0.40x	0.60x	0.80x	1x	3x	10x
Red One-Eyed	0.15x	0.20x	0.40x	0.60x	0.80x	1x	3x	10x
Green One-Eyed	0.10x	0.15x	0.20x	0.30x	0.60x	0.80x	1x	3x
Yellow One-Eyed	0.10x	0.15x	0.20x	0.30x	0.60x	0.80x	1x	3x

Reactoonz Slot Features

Reactoonz has no scatter symbol and no free spins, so the base game carries its own modifiers, and any of them can fire on an ordinary spin.

Giantoonz

Four matching aliens that land in a 2x2 square fuse into a single Giantoon. Only the eight regular aliens can do this. Any winning cluster with one or more Giantoonz in it pays double.

Fluctuation

At the start of each spin the game marks one type of one-eyed alien. A marked alien that joins a win leaves two wilds behind as it disappears, and those wilds sit on the grid for the next cascade.

Instability

If the first drop of a spin wins nothing, the Gargantoon may throw 4 to 8 wilds onto the grid. The rules give no odds for this, and it only applies to that first drop.

Reactoonz Slot Bonus Features

Quantum Leap meter

Every winning symbol charges the meter in the top right corner. Each time it collects 25 winning symbols, a random Quantum feature joins a queue that holds up to four. The queue fires once the grid has nothing left to pay, then the round carries on and the meter keeps charging. It only resets when the round ends.

The four Quantum features

Implosion turns 3 to 6 symbols wild and destroys every symbol next to them. Incision cuts a wild into the centre and draws two diagonal lines through the grid that show the same random symbol. Demolition wipes out every one-eyed alien. Alteration picks one type of one-eyed alien and turns all of them into another symbol.

Gargantoon

Charge the meter a fifth time in the same round and the Gargantoon lands as a 3x3 wild. After each cascade he splits and moves, first into two 2x2 wilds and then into nine single wilds, with fresh aliens filling the grid before every move. Five charges of 25 means 125 winning symbols inside one round.

Our Verdict Once the cascades stop, the Quantum queue can change the grid up to four times, and each change can set the cascades going again in the same round. We rate that. The Gargantoon is harder to reach: you need 125 winning symbols first, on a game with no free spins to fall back on.

Reactoonz Slot RTP & Volatility

RTP	Variable RTP	Volatility	Max Win
96.51%	Yes	High	4,570.30x stake

Play'n GO's rules give a default RTP of 96.51%, above the 96.00% median of the 392 slot reviews we sampled (October 2026). The bottom setting is 84.51%, and your casino decides which version you get, so check the rules screen in the game first.

Our Verdict Twelve points separate the 96.51% default from the 84.51% version, and the aliens on your screen look the same on both. For a game with this much going on, we find the default fair. The spread is what worries us.

Reactoonz Slot Graphics & Audio

Graphics

The grid floats over a deep blue starfield, with the Reactoonz logo glowing over a swirling portal on the left. The one-eyed aliens pay least: a yellow ball with spiral cheeks, a green blob on a stalk, a red block and a purple diamond. The four two-eyed aliens are chunkier and pull faces, from the pink one's angry brows to the green one's sleepy stare. On the right, the Gargantoon dozes in his capsule with all three eyes shut.

Reactoonz intro screen — The alien cast on the intro screen

The starfield and the logo portal

Reactoonz fluctuating aliens — Fluctuating aliens

Reactoonz Implosion blasts — Implosion blasts

Audio

Reviewers describe sci-fi whooshes and clicks over the music. The speaker icon in the bottom left corner turns the sound off.

Our Verdict Eight alien faces do the work on this screen, and you can tell each one apart at a glance. The starfield behind them is plain. Our pick is the Gargantoon, asleep in his capsule beside the grid, a standing reminder of what the meter is charging up for.

Reactoonz Slot on Mobile

Play'n GO's launch notes promised players could teleport between mobile, tablet and desktop, which suits a game whose aliens teleport off the grid after every win. It runs in HTML5 on Android and iOS, with the same features as the desktop version.

Reactoonz FAQs

How does the Quantum Leap meter work in Reactoonz?

Every 25 winning symbols add a random Quantum feature to a queue that holds up to four. A fifth charge in the same round brings in the Gargantoon, and the meter resets when the round ends.

What is the RTP of Reactoonz?

The default RTP is 96.51%. Play'n GO's lowest version is 84.51%, so open the rules screen at your casino to see where yours sits.

What is the max win on Reactoonz?

Play'n GO caps the wins from a single game round at 4,570.30x your total bet, features included.

Does Reactoonz have free spins?

No. There is no free spins round and no scatter symbol, and every feature triggers inside the spin that is running.

What are Giantoonz in Reactoonz?

A Giantoon forms when four matching aliens land in a 2x2 square. Any winning cluster that includes one pays double.

How do you get the Gargantoon in Reactoonz?

Charge the Quantum Leap meter five times in one round and he joins the queue as a 3x3 wild. On a non-winning first drop he can also throw 4 to 8 wilds onto the grid.