Jammin' Jars

Jammin' Jars is Push Gaming's breakout hit and the slot that helped popularise the cluster-pays-plus-roaming-multiplier formula now imitated across the industry. Released in 2018 with a vibrant disco-fruit theme, it plays on an 8x8 grid and combines tumbling clusters with wild Jam Jars that carry ever-growing multipliers, building toward a maximum win of up to 20,000x your stake. Its funky soundtrack and bright visuals have made it a long-running streaming and lobby favourite.

Wins are formed by clusters of five or more matching fruit symbols touching horizontally or vertically. Winning symbols then explode and new ones tumble down, so a single spin can produce a chain of consecutive wins. The bigger and longer the chain, the more the game's star feature — the Jam Jars — can take over.

Roaming Jar wilds and multipliers

The Jam Jar is the wild symbol, and it is unlike most wilds in slots. When a Jar lands and is part of a winning cluster, it stays on the grid and moves to a new random position on the next tumble, and crucially it carries a multiplier that starts at 1x and increases by 1 with every consecutive win it is involved in.

Because a Jar keeps roaming and climbing for as long as wins continue, a single strong sequence can push a Jar's multiplier into double or even triple figures. When two Jars are active at once and their multipliers combine on a big cluster, that is where Jammin' Jars produces its largest payouts.

Free spins, RTP and volatility

Landing four Jam Jars on the grid triggers the Rainbow feature: free spins in which the Jars and their accumulating multipliers do the heavy lifting. More Jars during the feature add extra spins, giving the multipliers more time to climb toward that 20,000x ceiling. Jammin' Jars runs at a notably high 96.83% default RTP — above the industry average — though operators may offer lower versions. It is a high-volatility slot with stakes from 0.20 to 100 per spin.

Tips and who it's for

The key to Jammin' Jars is the multiplier on each roaming Jar, so the longest winning chains — especially in the Rainbow feature — are what create big results. A measured stake helps you survive quieter spells until a Jar gets rolling. With its upbeat presentation and genuinely original mechanic, the game suits players who want something more distinctive than a standard payline slot but still easy to follow, and who enjoy the rising tension as a Jar's multiplier climbs.

Strategy and bankroll tips

The whole appeal of Jammin' Jars rests on the roaming Jar wilds and the multipliers they accumulate, so the longest winning chains are what matter most — and those happen most often in the Rainbow free-spins feature, where the multipliers carry across spins. In the base game your aim is simply to last long enough to land four Jars, so a stake of roughly 1% of your bankroll per spin is a sensible balance between survival and meaningful wins. Because the game is high volatility, expect quiet stretches between the fireworks, and never increase your bet to try to force a feature; cluster wins and Jar landings are random on every spin. Keep an eye on the RTP version your casino offers, since the headline 96.83% figure is unusually generous and not always the one in use. Set a session budget before you start and enjoy the upbeat disco energy for what it is — entertainment, not a route to profit.

Its success led to a sequel, Jammin' Jars 2, which expanded the formula, but the original remains a genuine modern classic and the best place to experience the roaming-Jar mechanic. Try Jammin' Jars in free demo mode here to see how the multipliers build before you play for real, and remember to set a budget and gamble responsibly.

How Jammin' Jars compares

At 96.83%, Jammin' Jars sits above the 96.49% median of the 16 slots we have reviewed, on high volatility. Return alone rarely settles the choice, though: volatility and the ceiling decide how that same percentage feels across a session. The table below puts Jammin' Jars next to the closest alternatives in our catalogue.

Every figure is the studio's default configuration. Operators are free to run a lower RTP build of many of these games — our guide to RTP explains why that happens and where to check the version you are actually playing.