Reactoonz vs Jammin' Jars

Reactoonz vs Jammin' Jars: two cluster engines

Both games use cluster pays: five or more matching symbols joined by their sides make a win, the winners disappear and new symbols fall in. Beyond that shared base, they take opposite routes to big results.

Reactoonz works like a battery. Every winning cluster adds charge, and charge releases features that destroy, transform or add symbols, culminating in a giant wild alien called Gargantoon. Jammin' Jars works like a dance floor. Jam jar wilds carry multipliers that grow as they keep joining wins, and in free spins they stay on the grid and move around, taking their multipliers with them.

Verified figures side by side

Play'n GO is a privately held studio based in Växjö, Sweden. Push Gaming was founded in 2010, is headquartered in London and has been majority-owned by LeoVegas Group, part of MGM Resorts, since a deal announced in May 2023. Both supply games in more than one RTP version, so check the live figure at your casino.

Reactoonz: charging towards Gargantoon

Every winning cluster in Reactoonz adds to a charge meter beside the grid. The game’s help screen names four Quantum features, Implosion, Incision, Demolition and Alteration, which between them add wilds, destroy symbols or transform them, all with the aim of setting off more clusters. When the meter is full, Gargantoon arrives as a giant wild on the grid and can set off a chain of further features.

Because all this happens inside ordinary paid spins, Reactoonz never sends you to a separate round. Big moments arrive without warning, in the middle of a cascade, and the game’s value is spread across long cascade chains rather than packed into one bonus. Our guide on how cascading reels work explains why long chains matter.

Jammin' Jars: wilds that carry multipliers

The jam jar is both a wild symbol and the free spins scatter. Each jar carries a multiplier that applies to any winning cluster it joins, and the value climbs as the jar keeps contributing to wins. When two or more jars sit in the same cluster, their multipliers combine; the help screen sets out exactly how in your version.

A worked cascade at 40p

The point is the shape: each cascade can improve the cluster and the multiplier at once. Most chains stop after one or two drops. A random Rainbow feature can also drop giant blocks of fruit on the grid, which act as many matching symbols at once.

Free spins: none vs sticky, moving jars

In Jammin' Jars’ free spins, jars stay on the grid and move between spins, keeping their multipliers. More jars landing add spins. Rounds where several jars build up high multipliers are where the 20,000x ceiling becomes possible; many rounds end with modest values. Feature buys are not offered in Great Britain, so jars are the only way in.

Reactoonz vs Jammin' Jars RTP

At 96.83%, Jammin' Jars sits among the higher published returns for a well-known slot. The £3.20 gap per £1,000 staked matters to regular players, provided the casino runs the top version. Our high RTP slots page lists other games above 96.5%.

4,570x vs 20,000x

Jammin' Jars has the higher ceiling and a slightly higher RTP. With both rated high volatility, that points to Jammin' Jars concentrating more of its value in rare outcomes, while Reactoonz spreads more across frequent cascades. In practice, Reactoonz tends to feel busier and Jammin' Jars quieter between bigger moments.

What to watch in a demo session

Demo play is available at UK-licensed casinos once your age is verified. A short demo cannot tell you which game will pay more, but it can show you which rhythm you enjoy.

1. Open each game in demo mode at the same stake.
2. In Reactoonz, watch the charge meter and count how often a Quantum feature fires in 50 spins.
3. In Jammin' Jars, note how often jars land and what multipliers they reach in the base game.
4. Compare how many spins in each game returned at least your stake.
5. Read each help screen for the RTP and the exact multiplier rules before playing for real money.

Sequels in both series

For more games built on connected groups, see our cluster pays slots page.

Which cluster slot suits you

• Choose Reactoonz if you enjoy constant movement, features that fire inside normal spins and a lower, more reachable ceiling.
• Choose Jammin' Jars if you want the higher RTP and ceiling and like a free spins round where multipliers build up.
• Choose neither if you prefer steady, predictable sessions; both are high volatility.

Where to play Reactoonz and Jammin' Jars

Search for each game after logging in, as lobbies change, and confirm the RTP in the help screen. 10bet matches a first deposit 100% up to £25 with 10x wagering on slots within 3 days and a £1,000 cap on bonus winnings. Casumo matches 50% up to £100 on a first deposit of £20 or more, with 10x wagering within 7 days and a £5 max bet. Coral’s offer is 100 spins at 10p on selected slots once you have staked £10 on slots, and spin winnings carry no wagering. 18+, new customers, T&Cs apply.

18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set limits. Free, confidential help: National Gambling Helpline 0808 8020 133.