Slots Like Gigantoonz: The Quantumeter Explained

Gigantoonz brings Play’n GO’s cartoon alien cast back for a second outing, swapping the free spins structure of earlier Toonz games for one continuous base game built around an 8×8 grid and a charge meter called the Quantumeter. Winning clusters of 6 or more matching symbols clear from the board and cascade in fresh icons, and every symbol involved in a win adds a charge to the meter, climbing it towards four progressively bigger modifiers rather than a separate bonus round. Mega Symbols ranging from a compact 2×2 up to a full 7×7 block can appear on the grid, counting as a single connected symbol worth a randomised cluster value, and when one is cleared it leaves a wild behind. The Quantumeter unlocks Disintegration at 25 charges, Metamorphosis at 50, Radiation at 75 and the two step Gargantoonz modifier once it hits its 100 charge cap, after which it resets and starts climbing again. The RTP tops out at 96.25% across five available settings, volatility is rated 10 out of 10 by Play’n GO’s own scale, and the maximum win reaches 4,000 times the stake.

Where to Play

18+ only. T&Cs apply. Please gamble responsibly.

How the Game Works

Reviewed by Paul Stone
Published: July 2026

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The board holds 8 columns and 8 rows of one-eyed and two-eyed cartoon Toonz, with wins formed by clusters of 6 or more matching symbols connected horizontally or vertically. Cleared clusters make way for a cascade of fresh symbols dropping in from above, and the sequence keeps going for as long as new qualifying clusters keep appearing.

Mega Symbols occasionally take up a block of the grid instead of a single tile, sized anywhere from 2×2 through to the full 7×7. Each one counts as a single connected symbol for cluster purposes but carries its own randomised value worth up to 13, and when a Mega Symbol clears it leaves a wild in its place with any remaining empty cells refilled by ordinary 1×1 versions of the same symbol.

Quantum Wilds

Any spin that does not produce a winning cluster has a chance to add between 5 and 10 Quantum Wild symbols to the grid instead, keeping the board active even through a quiet run and setting up positions for the next spin to build from.

The Quantumeter

Every symbol that takes part in a winning cluster adds one charge to the Quantumeter, with Mega Symbols contributing their full cluster value at once. The meter fills toward a 100 charge cap, unlocking a modifier at each of four thresholds along the way before resetting and starting the climb again.

25 charges, Disintegration: four randomly chosen symbol types are wiped from the board entirely, clearing space for fresh drops.
50 charges, Metamorphosis: every instance of one symbol type, including Mega Symbols, transforms into a different one.
75 charges, Radiation: between 1 and 4 fresh Mega Symbols and 2 to 5 Quantum Wilds are seeded onto the grid at once.
100 charges, Gargantoonz: a two step modifier where existing Mega Symbols first convert into giant Gargantoonz versions, with at least three guaranteed to appear alongside 2 to 4 smaller 1×1 copies, before they break apart into ordinary symbols and clear from the board in the usual way.

Pros and Cons

Pros

• The Quantumeter gives every spin a sense of building toward something, rather than waiting on a rare standalone bonus trigger
• An 8×8 grid with Mega Symbols up to 7×7 creates a genuinely different visual scale to most cluster pays slots
• Five selectable RTP settings give operators, and by extension players who know to check, some room to shop around
• Folding all four modifiers into the base game keeps the pace steady rather than gating the best moments behind free spins
• The Toonz character designs carry over the charm that made the original Reactoonz games popular

Cons

• A 4,000x ceiling is noticeably lower than several of Play’n GO’s other high volatility Toonz-style releases
• The lowest available RTP setting of 84.25% is well below UK market norms if a casino opts for it
• Four separate modifiers layered on top of Mega Symbols and Quantum Wilds takes a while to fully absorb
• Without a dedicated free spins round, some players may miss having a clearly signposted bonus feature to chase

Game Screenshot

Gigantoonz can be trialled for free at its top 96.25% RTP setting, which is worth doing given how differently the game can play once the Quantumeter starts reaching its higher thresholds.

Expert Take

Reviewers have generally welcomed the decision to move away from a separate free spins bonus and instead build the entire experience around the Quantumeter, seeing it as a simpler and more transparent structure than some of Play’n GO’s earlier Toonz entries. The lower 4,000x ceiling compared to genre rivals is the most common criticism, though the steady buildup toward Gargantoonz is still seen as a satisfying payoff in its own right.

Similar Slots to Try

Between the cartoon alien cast and the cluster pays engine underneath it, two threads tend to pull players toward this page. These nine sit close to one or the other.

• Energoonz
  
  An earlier Play’n GO release starring a related cast of alien characters, built around its own cluster pays format.
• Gemix
  
  A match style Play’n GO title with its own cascading structure, worth a look for fans of the studio’s cluster mechanics.
• Sweet Alchemy
  
  A large-grid Play’n GO cluster pays slot with its own escalating multiplier system.
• Sticky Joker
  
  A different style of Play’n GO release entirely, useful for seeing the range the studio covers beyond cluster formats.
• Reactoonz
  
  The Play n GO cluster pays hit that Gigantoonz builds directly on, with a similar cartoon alien cast and Gargantoon feature. The most obvious next stop for fans of this exact house style.
• Honey Rush Black and Yellow
  
  Another Play n GO cluster pays title, swapping the alien cast for a beehive setting. Shares the same cascading grid engine that makes Gigantoonz tick.
• Carnival Queen 2
  
  A Thunderkick carnival release with its own Avalanche and Infinite Multiplier system, a good next stop for fans of chain-reaction cluster mechanics.
• Gemix 2
  
  A returning cast of gem-hunting heroes stands in for the cartoon aliens here, with a Crystal Charge Meter and World Bonus pattern adding extra layers on top of cluster pays.
• Grand Melee
  
  A medieval carnival theme from the same studio, running a random Sticky Respin trigger in place of the Quantumeter and expanding Mega Symbols used here.
• Sugar Rush 1000
  
  This game runs a Quantumeter multiplier system of its own, giving Play’n GO’s take on the cluster-pay format a distinct feel from the Pragmatic Play engine behind this page.
• Candy Corner
  
  Play’n GO’s cluster-pay pick leans on its own Quantumeter multiplier rather than the dedicated corner tiles a Pragmatic Play sibling runs on.
• Sweet Kingdom
  
  This smaller-grid cluster pick grows its own multiplier symbol instead, sharing little mechanically with the locked Money Symbols found here.
• The Dog House Muttley Crew
  
  A growing multiplier symbol on a tighter grid drives this pick instead, with nothing beyond the shared cluster-pays format in common with the pirate crew here.

About the Developer

Gigantoonz comes from Play’n GO, the Swedish studio behind the original Reactoonz series that this release borrows its cast and general cluster pays approach from. Rather than repeating that format directly, the design team built an entirely new progression system around the Quantumeter, showing a willingness to rework a proven idea instead of simply reskinning it. See more on our Play’n GO slots page.

Gigantoonz Key Stats

Gigantoonz slot information last reviewed: July 2026

Slots with the Same Features

Looking past the theme, here are picks tied to the two mechanics that define this one.

High Volatility Slots

Games rated for infrequent but potentially outsized returns, matching Gigantoonz’s own 10/10 rating.

Cascading Wins Slots

Slots that clear winning symbols and drop fresh ones into their place, the same base mechanic driving every spin here.

Frequently Asked Questions

What grid size does Gigantoonz use?

Gigantoonz runs on an 8×8 grid, with wins formed by clusters of 6 or more matching symbols connected horizontally or vertically.

What are Mega Symbols in Gigantoonz?

Mega Symbols are blocks of matching icons sized anywhere from 2×2 up to 7×7 that count as a single symbol for cluster purposes, carrying a randomised value of up to 13 and leaving a wild behind when cleared.

How does the Quantumeter work?

Every symbol in a winning cluster adds a charge to the Quantumeter, unlocking Disintegration at 25 charges, Metamorphosis at 50, Radiation at 75 and the two-step Gargantoonz modifier at its 100 charge cap, after which it resets.

Does Gigantoonz have free spins?

No, Gigantoonz has no separate free spins round. All of its bonus value comes from the Quantumeter modifiers playing out within the base game.

What is the RTP of Gigantoonz?

The RTP ranges across five settings from 84.25% up to a top rate of 96.25%, depending on which configuration a casino has chosen.

What is the maximum win on Gigantoonz?

The maximum win is 4,000 times the stake.

Who makes Gigantoonz?

Play’n GO, the Swedish studio behind the original Reactoonz series. Gigantoonz launched in January 2022.

Our Verdict on Gigantoonz

Gigantoonz succeeds by trusting its own new idea rather than leaning on the Reactoonz name it is clearly descended from, and the Quantumeter gives the base game a genuine sense of progression that most cluster pays slots simply do not offer. The scale of an 8×8 grid with Mega Symbols up to 7×7 keeps the presentation feeling substantial throughout, even if the 4,000x ceiling will not satisfy players chasing the very biggest headline wins. Anyone who enjoys watching a meter climb toward a payoff, rather than waiting on a separate bonus trigger, should find plenty to like here.

SlotsLike rating: 8/10