Reactoonz Pros & Cons
Reactoonz delivers on uniqueness but comes with trade-offs. The cluster pays system and charging meters create gameplay that's way more engaging than standard slots. Still, high volatility can drain your balance before features trigger.
- 96.51% RTP beats industry standard
- Unique cluster pays mechanic keeps it interesting
- Multiple bonus features charge during base game
- Low £0.20 minimum bet for casual play
- Great mobile experience in Portrait Mode
- High volatility = brutal dry spells between wins
- Max win 4,570x is low compared to modern slots (Pragmatic offers 5,000x+)
- No traditional free spins round for bonus hunters
- RTP can drop to 84.51% at some casinos
- Learning curve - not beginner-friendly like Starburst
Reactoonz Slot Review: Cute Aliens and Cluster Chaos
Play'n GO dropped Reactoonz in October 2017, and it became one of the most popular cluster pays slots ever made. You get a 7x7 grid full of cute alien creatures, cascading wins, and tons of meter-charging bonus features. Here at SlotsGamblers, we tested this high-volatility slot and found the 96.51% RTP to be solid. However, the 4,570x max win isn't massive compared to modern slots. The main attraction? The Gargantoon feature - a 3x3 wild that splits into smaller wilds and can create some nice wins. It's not your traditional slot with paylines, so if you're used to standard 5-reel games, this'll feel different. The game uses cluster pays, meaning you need 5+ matching symbols touching each other to win. Cascades keep happening as long as you keep winning, and they charge up the Quantum Leap meters for random features. It's been around for almost 8 years and still gets tons of play because the mechanics work and the alien theme is fun without being childish.
The slot's got character. The aliens are animated with personality, there's a snoring Gargantoon in the corner, and the whole thing feels like an arcade game from space. High volatility means dry spells happen, so your bankroll needs to handle that. But when features line up and meters fill, payouts can get interesting fast. Suitable for players who want something different from standard slots, but high-rollers chasing huge multipliers should look elsewhere.
| Specification | Details |
|---|---|
| Developer | Play'n GO |
| Release Date | October 24, 2017 |
| Reels x Rows | 7x7 Grid |
| Paylines / Ways to Win | Cluster Pays (5+ matching adjacent symbols) |
| RTP (Return to Player) | 96.51% (default) other versions: 94.51%, 91.49%, 87.50%, 84.51% |
| Volatility Level | High |
| Min Bet | £0.20 / €0.20 / $0.20 |
| Max Bet | £100 / €100 / $100 |
| Max Win Potential | 4,570x total bet |
| Hit Frequency | N/A |
| Default Bet Range | £0.20 - £100 |
| Mobile Compatible | Yes (HTML5, iOS & Android) |
Symbols & Payouts
8 alien symbols total - 4 one-eyed low payers and 4 two-eyed high payers. Wild (Vortex Wild) substitutes for everything. Gargantoon is a special wild that only appears during features.
👁️ Yellow One-Eyed Alien - Low Value
A basic, low-value alien that constantly appears on the grid. Yellow with a single eye and a simple design. You need 15+ in a cluster to get 3x your total bet, not much payout. But these fill the grid often and help charge the Quantum meters during cascades. Design is cute without being childish, and the animation is just a quick bounce when it wins.
👁️ Green One-Eyed Alien - Low Value
Another low payer with one eye, green colored. Same 3x payout for 15+ symbol clusters. These one-eyed aliens are your bread and butter for small wins and keeping cascades going. The green one has a slightly different animation from the yellow, but functions identically. You'll see tons of these, and they're critical for building up quantum charges even though payouts are minimal.
👁️ Red One-Eyed Alien - Low Value
Red single-eye aliens pay 10x your bet for 15+ symbols—still low value but better than yellow and green. The red color makes it stand out more on the grid. When these form significant clusters, you'll actually see decent returns combined with cascades. Design is consistent with the other one-eyed creatures, just a different color palette.
👁️ Purple One-Eyed Alien - Low Value
Last of the one-eyed aliens, purple colored, and pays 10x for 15+ clusters. Similar to the red one in terms of value. These four one-eyed symbols are the meat of the game - they appear frequently, create the base layer of wins, and charge your meters. Not exciting payouts, but necessary for getting to the good stuff.
👀 Blue Two-Eyed Alien - High Value
First of the premium aliens with two eyes. Blue colored and pays 75x your bet for 15+ symbols in a cluster. Now we're talking actual money. These appear less frequently than one-eyed aliens, so landing significant clusters feels rewarding. Animation is more elaborate, with both eyes blinking and the alien bouncing around. You want to see these in your cascades.
👀 Orange Two-Eyed Alien - High Value
Orange premium alien pays 150x for 15+ matching symbols. Double what the blue one offers. The orange color pops nicely against the dark background. When you land a full screen of these during a Gargantoon feature, wins can get substantial. Two-eyed aliens are your ticket to actual profit because one big cluster can cover dozens of losing spins.
👀 Green Two-Eyed Alien - High Value
Bright green two-eyed creature pays 300x your total bet for 15+ symbols—this one's serious money. The bright green is different from the darker one-eyed green alien, so that you won't confuse them. Landing even a decent-sized cluster of 10+ pays well. The animation shows both eyes wide open, and it's one of the symbols you desperately want during quantum features.
👀 Pink Two-Eyed Alien - High Value
Top-paying symbol in Reactoonz. Pink alien with two eyes pays 750x your bet for 15+ symbols in a cluster. This is the jackpot symbol you're chasing. Get a screen full during Gargantoon and you'll hit the max win territory. The pink really stands out visually, and you'll notice it immediately when several land. Animation is the most elaborate of all aliens, celebrating when it forms winning clusters.
🌀 Vortex Wild - Special Symbol
A yellow swirl of energy that substitutes for all paying symbols. Doesn't land naturally on the grid - it's generated through features like Fluctuation (low-value symbols turn into 2 wilds) or Quantum features. When wilds appear during cascades, they can complete clusters you wouldn't have hit otherwise. Critical for chaining multiple wins together and filling Quantum meters faster.
👾 Gargantoon Wild - Special Symbol
The big guy. Only appears when you fully charge all 5 Quantum Leap meters—lands as a massive 3x3 wild covering 9 symbol positions. Substitutes for everything and basically guarantees wins. After the cascade ends, he splits into two 2x2 wilds, then finally into nine 1x1 wilds. Each split creates new cascades. This is the feature that makes Reactoonz special. When Gargantoon shows up, money's coming.
| Symbol | 15+ Symbols | 10-14 Symbols | 6-9 Symbols |
|---|---|---|---|
|
Pink Alien (2-eyed)
|
750x | 150x | 50x |
|
Green Alien (2-eyed)
|
300x | 100x | 30x |
|
Orange Alien (2-eyed)
|
150x | 50x | 15x |
|
Blue Alien (2-eyed)
|
75x | 25x | 7.5x |
|
Purple Alien (1-eyed)
|
10x | 5x | 2x |
|
Red Alien (1-eyed)
|
10x | 5x | 2x |
|
Green Alien (1-eyed)
|
3x | 2x | 1x |
|
Yellow Alien (1-eyed)
|
3x | 2x | 1x |
|
Vortex Wild
|
Substitutes for all symbols | - | - |
|
Gargantoon Wild
|
3x3 wild - 2x2 wilds - 9x 1x1 wilds | - | - |
Bonus Features
One central charging system with 5 quantum features, plus a few random modifiers. No traditional free spins - everything happens in the base game through meter charging.
| Feature Name | Trigger Method | Description | Max Potential | Frequency |
|---|---|---|---|---|
|
Quantum Leap Implosion
|
Fill meter with 25 symbols | Transforms 3-6 symbols into wilds, destroys adjacent symbols | Varies | Common |
|
Quantum Leap Incision
|
Fill meter with 25 symbols | Places wild in center, creates two diagonal crossing lines through grid | Varies | Common |
|
Quantum Leap - Demolition
|
Fill meter with 25 symbols | Removes all one-eyed symbols, leaves only high-paying two-eyed aliens | Varies | Common |
|
Quantum Leap Alteration
|
Fill meter with 25 symbols | Randomly transforms one symbol type into another for better matches | Varies | Common |
|
Gargantoon
|
Fill all 5 Quantum meters | 3x3 wild - splits to 2x 2x2 wilds - splits to 9x 1x1 wilds | 4,570x | Rare |
|
Instability
|
Random on non-winning spins | Drops 4-8 wild symbols randomly onto grid | Small-Mediu m | Occasional |
|
Fluctuation
|
Marked symbol wins | One glowing one-eyed symbol leaves 2 wilds when part of winning cluster | Small | Very Common |
|
Giantoonz
|
4 matching symbols in 2x2 square | Merges into giant 2x2 symbol, doubles wins if part of cluster | Medium | Medium |
RTP & Volatility
96.51% RTP at default is solid, but watch out for lower versions. High volatility means swings are brutal.
| Metric | Value |
|---|---|
|
Min Bet
|
£0.20 / €0.20 / $0.20 |
|
Max Bet
|
£100 / €100 / $100 |
|
Max Win
|
4,570x (£4,570 on £1 bet, £457,000 on £100 bet) |
|
RTP %
|
96.51% (default), also: 94.51%, 91.49%, 87.50%, 84.51% |
|
Volatility
|
High |
Mobile
Works perfectly on mobile. HTML5 build runs smoothly on iOS and Android. Portrait Mode actually suits the 7x7 grid better than landscape—no lag or performance issues.
Tips
Check the RTP first
Open game rules and confirm it's 96.51%, not one of the lower versions. Seriously, some casinos run this at 84.51%.
Budget for volatility
Bring 100-150x your bet size minimum. High variance will eat small bankrolls fast before features trigger.
Watch the Quantum meter
When you're 1-2 features away from Gargantoon, stick around. Walking away before that pays off is painful.
Demolition is king
When this quantum feature triggers, only premium aliens fill the grid. Big wins happen here more than in the other features.
Low bets for learning
Play £0.20 spins till you understand the meters and features. Complex mechanics mean mistakes cost money.
Similar Games
Reactoonz 2
The sequel from 2020 with updated features, Fluctometer and Quantumeter, 96.2% RTP, and 5,083x max win—more polished but similar feel.
Jammin' Jars (Push Gaming)
Another popular cluster pays slot with an 8x8 grid, cascading wins, and moving wild jars. More chaotic than Reactoonz.
Moon Princess (Play'n GO)
5x5 grid cluster with anime girls and charging meters. Feels like Reactoonz's little sister with lower volatility.
Gemix (Play'n GO)
Different worlds with cluster pays mechanics and special features, more variety in themes, but similar grid gameplay.
Play Responsibly - 18+ Only
Gambling should be entertaining and fun. Remember that slots are games of chance, and there's no guaranteed way to win. Never gamble more than you can afford to lose, and always set limits for yourself. If you feel gambling is becoming a problem, please seek help immediately.
FAQ - Frequently Asked Questions
How do you actually trigger the Gargantoon feature?
You need to fill the Quantum Leap meter 5 separate times (25 symbols each fill, so 125 total winning symbols). Each fill queues up one of the 4 random quantum features, and after all 5 triggers, Gargantoon appears as a 3x3 wild.
What's the Fluctuation feature, and why does it matter?
Every spin marks one random one-eyed symbol with a glowing aura. If that symbol is part of a winning cluster, it leaves behind 2 wild symbols during the cascade, helping chain more wins and charge the Quantum meter faster.
Can Gargantoon appear more than once in a single spin session?
Yeah, but you need to recharge all 5 meters again after he triggers. Realistically, this is rare because filling 125 symbols takes time and money. In most sessions, you'll see him once or not at all.
Why is Reactoonz still so popular after 7+ years?
The cluster pays mechanics and meter-charging system created a gameplay loop that's more engaging than spinning standard reels. Plus, Gargantoon splitting into smaller wilds is satisfying to watch. It basically invented the formula that tons of grid slots copied.
What's the difference between Vortex Wild and Gargantoon Wild?
Vortex Wild is a regular 1x1 wild that appears through features like Fluctuation. Gargantoon is the massive 3x3 wild that only comes after charging all meters, and he splits into progressively smaller wilds across multiple cascades for huge win potential.
Is Reactoonz better than Reactoonz 2?
Depends. The original has a slightly higher RTP (96.51% vs 96.2%), but Reactoonz 2 offers a larger max win (5,083x vs 4,570x) and more polished features. We tested both - original feels cleaner, sequel has more going on. Try both in demo mode.
How often does the Instability feature actually trigger?
It's random on non-winning spins, so frequency varies wildly. Some sessions, you'll see it 3-4 times in 50 spins; other times, it won't show for 100+ spins. When it drops 8 wilds instead of 4, cascades usually follow.
What's the biggest mistake beginners make with Reactoonz?
Betting too high, too fast, without understanding the volatility. High variance means you can easily lose 20-30 bets in a row before features trigger. Start at £0.20-£0.50 till you see how brutal the swings are, then adjust bet size based on your bankroll.