Reactoonz 2 slot review

Reactoonz 2 quick facts

Reactoonz 2 follows the original Reactoonz, keeping the cluster pays idea but building its features around a new set of wilds and two charge meters.

Play'n GO built its first gaming product in 1997, is based in Växjö, Sweden, and is independent and privately held. Its best-known games include Book of Dead and Legacy of Dead. See the Play'n GO page for more, or the slots hub for every review.

How the Reactoonz 2 cluster pays grid works

There are no reels or lines in the usual sense. Symbols fill a 7 × 7 grid, 49 positions in all, and any group of five or more identical symbols touching each other pays. That's cluster pays. After a win, the cluster disappears, the symbols above drop down and new ones fill the gaps from the top, which is cascading reels applied to a grid. Each fresh drop can form a new cluster, so one paid round can pay several times.

Bigger clusters pay more, and the paytable shows how much each symbol pays at each cluster size for your stake. Because cascades chain, what you see on screen in one round can be a sequence of wins, and the game totals them at the end.

How the features work

Uncharged and Electric wilds

Some wilds land uncharged. When a winning cluster forms next to one, it becomes an Electric wild. Electric wilds are what feed the game's main meter, so the base game's job is partly to land clusters in the right places to charge them.

The Quantumeter

Electric wilds charge the Quantumeter. As it climbs to higher levels, it adds bigger features to the grid: large Energoon wilds, or a 3x3 Gargantoon wild. A 3x3 wild covers nine of the 49 positions in one go, which is a big share of the board for completing clusters.

The Fluctometer

The second meter, the Fluctometer, is charged by fluctuating symbols that are part of winning clusters. When it pays out, it can award extra Electric wilds, which in turn feed the Quantumeter. The two meters work together: one can top up the other.

This follows the developer's description as set out by Casinos.com's Reactoonz 2 review (opens in a new tab) and Gambling.com's guide (opens in a new tab). Exact meter thresholds and what each level does are in the game's help screen.

Reactoonz 2 meters side by side

Meters can make it feel as if the game owes you a feature once a bar is nearly full. It doesn't. Each new symbol drop is random, and a half-charged meter is not a reason to keep playing or to raise your stake.

Reactoonz 2 RTP: what “top version” means

Play'n GO's published RTP for Reactoonz 2 is 96.2% for the top version. Studios often supply a game at more than one RTP, and the casino chooses which to run. The version on offer must be shown in the game's information, and our page on RTP information rules explains what UK casinos have to tell you.

Each percentage point matters. At the top version the edge is 3.8%, so £3.80 average cost per £100 staked. If a casino ran a version two points lower, the edge would be 5.8% and the average cost £5.80 per £100: about half as much again. We don't list the lower versions' exact figures because they're not in our verified data, so check the panel.

High volatility and the 5,083x Reactoonz 2 max win

Reactoonz 2 is rated high volatility. A lot of its return depends on charging the Quantumeter, so many rounds produce a small cluster or two, and a few produce much more. Short sessions often land well away from the averages above.

The top prize of 5,083 times stake is £508.30 at 10p, £2,541.50 at 50p, £5,083 at £1, £10,166 at £2 and £25,415 at £5. The final two stakes are the UK slot caps for 18–24s and for players aged 25 and over. It's a ceiling, not a likely result.

Reactoonz 2 vs Reactoonz and Gigantoonz

The original has the highest published RTP of the three; the sequel has the highest ceiling. All three are high volatility, so the choice comes down to which feature set you prefer. For other grid games, compare Jammin' Jars, a cluster pays slot at 96.83%.

How to play Reactoonz 2 online, step by step

1. Create an account at a UK-licensed casino and complete age and identity verification.
2. Set a deposit limit at the prompt, then a session budget of your own.
3. Open Reactoonz 2 and check the RTP in its information panel to see which version is running.
4. Choose a stake within the UK cap for your age group.
5. Start each round by hand; clusters pay and cascade until no new win forms.
6. Watch the Quantumeter and Fluctometer, but don't let a full-looking meter change your plan.
7. Use the on-screen net position and timer, and stop at your limit.

UK rules for Reactoonz 2

Reactoonz 2 counts as an online slot in Great Britain, so the slot stake caps apply: £5 per round for players aged 25 and over since 9 April 2025, and £2 for 18–24s since 21 May 2025. Design rules in force since 31 October 2021 ban autoplay, turbo and slam-stop, set a 2.5-second minimum per round and stop returns at or below your stake being celebrated as wins. Since 17 January 2025, net spend and time played must be shown in real time.

Feature buys aren't available: since a Gambling Commission warning in January 2020, feature buy-ins are not offered to British players. See our guides to slot stake limits and the autoplay ban.

Keeping Reactoonz 2 sessions in proportion

Fast cascades and filling meters are designed to be absorbing. A few habits help keep a session to the budget you set:

• Decide your loss limit before the first round and stick to it.
• Take a break when a meter feels “nearly there”; that feeling is the design, not the maths.
• Turn on deposit limits and reality checks in your casino account.
• If gambling stops being fun, GamCare (opens in a new tab) runs the free National Gambling Helpline on 0808 8020 133, 24 hours a day.

Where to play Reactoonz 2

Check the casino's game lobby to find Reactoonz 2; we can't confirm which partner carries it. Our partners' welcome offers are slot offers on named or selected games, so they may not apply here. 18+ and terms apply.

• PlayOJO: new UK customers, Northern Ireland excepted, get 80 free spins on Big Bass Bonanza at 10p each with a first deposit of £10 or more. No wagering; winnings are paid in cash. Can't be combined with other offers; designated offer link only.
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• Ladbrokes: spend £10 or more on slots after depositing as a new customer to get 50 free spins a day for 10 days, 500 maximum, at 10p on selected games. Claim before 23:59 daily; each set lasts 7 days and has no wagering. A deposit by prepaid card, PayPal, Paysafe, Neteller, Skrill or Moneybookers won't count.

Both Coral and Ladbrokes are operated by LC International Limited, so one person may not be able to open new accounts at both.

18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.