Reactoonz Cluster Pays Guide: Features, Strategy and How to Win

Reactoonz is one of Play'n GO's most distinctive and widely recognised titles. Released in 2017, it introduced a 7×7 cluster-pays grid populated by alien creatures — and the Gargantoon, a 3×3 wild that dominates the grid when the Quantum Leap meter reaches maximum charge. For South African players encountering it for the first time, the game can look chaotic. This guide explains exactly how it works, from base mechanics to the full Quantum feature set.

Quick Stats

• RTP: 96.51%
• Volatility: High
• Grid: 7×7 (49 symbols)
• Win Mechanic: Cluster pays (minimum 5 connected symbols)
• Max Win: 4,570× stake
• Release Year: 2017
• Special Feature: Gargantoon 3×3 wild

The 7×7 Grid and Cluster Mechanics

Reactoonz uses a 7×7 grid — 49 symbol positions — which is considerably larger than a standard 5×3 slot layout. Wins require a minimum of five matching symbols connected horizontally or vertically (not diagonally). Larger clusters pay more: a cluster of 5 might pay 1× stake, while a cluster of 20+ symbols of the highest value can pay many multiples of that. There are eight symbol types in total, divided into four low-value pairs (each pair shares a win outcome) and four high-value single types, including the rare single-eyed alien — Reactoonz's top-paying character.

After each winning cluster is removed, all symbols above the cleared positions fall down to fill the gaps (gravity mechanic). New symbols fill from above. This cascade continues until no winning clusters form. Multiple cascades from a single spin are frequent in Reactoonz due to the large grid.

The Quantum Leap Meter

The Quantum Leap meter sits on the right side of the screen and charges as winning clusters form. It has five positions. As it charges, Quantum features unlock. These features activate during spin resolution — specifically after a cascade pays out but before the next cascade evaluation:

• Quantum Wild: One or more wild symbols are placed randomly on the grid. Wilds substitute for any symbol and count for cluster formation.
• Quantum Chain: One symbol type is randomly selected and all instances of that symbol become wilds for the current cascade.
• Quantum Demolition: All instances of the two lowest-value symbol types are removed from the grid simultaneously, clearing space for higher-value cluster formation.
• Quantum Alteration: One symbol type is randomly changed into another — specifically, lower-value symbols are converted to a higher-value type.

Each position on the Quantum Leap meter corresponds to one of these features. As the meter fills, more features unlock — potentially multiple features activating within a single extended cascade sequence. The exact combination of features that activates depends on the cascade wins during the spin.

The Gargantoon

When the Quantum Leap meter fills to its maximum (all five positions), the Gargantoon appears. The Gargantoon is a 3×3 wild — nine grid positions — that can land anywhere on the 7×7 grid. It substitutes for all symbols across its nine positions simultaneously, creating potential for large cluster formations around its edges.

After any cascade where the Gargantoon is present, it splits. A 3×3 Gargantoon splits into three 2×1 wilds. These 2×1 wilds then split into individual 1×1 wilds on the following cascade. By the third cascade, the Gargantoon has become nine separate wild symbols distributed across the grid. The Gargantoon is the signature feature of Reactoonz and the most memorable visual moment in any session — and it produces the game's largest single-spin wins when it lands in a position that connects with multiple high-value clusters.

Fluctometer and Electrometer: How They Differ in Reactoonz 2

The original Reactoonz uses a single Quantum Leap meter. Reactoonz 2 splits this into two meters — the Fluctometer and Electrometer — that operate on separate alien type groups. This creates a more structured path to features and somewhat reduces the randomness of which features activate. Players who find the original's randomness frustrating may prefer the sequel's more predictable feature path.

Volatility and Session Planning

Reactoonz is rated high volatility. The cluster-pays structure means many spins produce nothing — the 7×7 grid is large, but five matching symbols connected correctly is not guaranteed on every spin, particularly with eight symbol types available. The Quantum features and Gargantoon are where the concentrated returns live, and reaching them requires the meter to charge through winning cascades.

Session planning for Reactoonz should assume a minimum of 200 spins at your chosen bet level. The meter-charging mechanic means short sessions may end before the Gargantoon is seen even once. At R10 per spin, this is R2,000 as a recommended minimum. For casual sessions on a tighter budget, R2 per spin over the same 200-spin window (R400) delivers the same feature experience at one-fifth the absolute cost.

Comparing Reactoonz to Moon Princess and Sweet Alchemy

All three are cluster-pays slots from Play'n GO but differ meaningfully in how features are triggered and what drives variance. Moon Princess requires all three princess meters to fill simultaneously — a convergence condition. Reactoonz builds a single meter through wins — a simpler accumulation. Sweet Alchemy has the Cauldron mechanic with persistent session multipliers. Each suits a different playing preference. If you enjoy watching a progress meter charge and want a dramatic single feature trigger, Reactoonz's Gargantoon moment is the most visually impactful in the cluster-pays category.

Read the full Reactoonz slot review →

Where to Play Reactoonz in South Africa

Reactoonz is available at all South African online casinos carrying Play'n GO software. It is consistently among the most-played titles at participating platforms. Our casino guide covers the best ZAR-compatible options with current bonus information. Both Reactoonz and Reactoonz 2 are available in demo mode — see our demo play page to try both before committing real money.

Frequently Asked Questions