Jammin’ Jars review
Jammin’ Jars is one of Push Gaming’s best-known slots, released on 18 September 2018. Fruit and berries dance on a disco floor, and the stars of the show are jam jars that hop around the grid building multipliers. Cluster pays, cascades and growing Wild multipliers made it a benchmark that many cluster slots are still compared to. Recognition came quickly. In December 2018 it won Best High Volatility Game at the Videoslots Awards, and players on Casino Grounds voted it the best slot of the year.
Six fruits on an 8×8 grid
Paylines don’t exist here. Five or more identical fruits that touch along a row or column form a paying cluster, in any shape: straight, bent or snaking across the grid. The six symbols are blueberries, plums, apples, raspberries, oranges and strawberries, with strawberries paying the most.
After payment, symbols disappear, gaps refill and fresh groups continue the chain. The help provides full coefficients. Sixty-four cells and six types do not imply uniform frequency:64/6 does not establish the probability of an adjacent group. The Cluster Pays explainer explains the principle.
Jar Wild: 1x,retention,hop,+1
The jar is both Wild and Scatter. Its starting 1x applies to a win containing it; after participating in a winning cascade, the jar remains, hops to an adjacent empty cell and adds one to its multiplier. Five participations give 6x, and ten give 11x. A spin without its winning participation adds nothing. Several jars in one group apply their multipliers, but their precise combination is unspecified here; sum or product cannot be chosen arbitrarily.
A hop does not transport a jar across the whole grid. Interior cells have four neighbours, edges three and corners two;8×8 has four corners, twenty-four non-corner edges and thirty-six interior cells. This is geometry rather than measured winning probability. Without symbol and transition weights, it cannot establish that central jars grow more often or opposite-corner jars almost never meet.
Rainbow and six free spins
Rainbow triggers at random after a spin with no win. A rainbow appears over the grid and adds giant fruit symbols that can form a big cluster. It works as a kind of consolation: a spin that paid nothing sometimes gets turned into a winner.
Rainbow probability is unspecified; giant fruits can create a group without guaranteeing payment. Rainbow does not operate in free spins. At least three jars on one board award six spins: triggering and new jars stay to the end, and multipliers persist even after blanks. An additional-free-spin rule is not listed, so lack of mention does not prove strictly fixed length.
| Point in the round | Jar A | Jar B | Jar C |
|---|---|---|---|
| Start | 1x | 1x | 1x |
| After spin 2 | 3x | 1x | 2x |
| After spin 4 | 5x | 2x | 4x |
| Before spin 6 | 7x | 2x | 6x |
The table is an invented round: jar A received six increments, C five and B one. A nominal 0.5x group with A alone at 7x pays 3.5x. If C at 6x also joins, the exact award requires the two-multiplier combination rule. Starting spin count does not equal payout count because cascades can occur inside each spin.
The original description allows a direct buy at some operators, but the studio page gives neither its price nor a separate RTP. Button availability and parameters must be established from the active build; main-game return does not establish buy return.
Two returns and observed wins
RTP is 96.83% or 94.25%, a difference of 2.58 percentage points. Volatility is high; hit and feature rates are unpublished. Wild Swarm lists 97.03% in the catalogue, a percentage comparison rather than a result promise. Stakes are 0.2–100. The studio’s 19,998.5x record is observed; the rounded catalogue figure of 20,000x establishes neither a formal limit rule nor early termination.
In January 2019, Push Gaming reported €19,361.80 from a €1 stake, and two weeks later £17,174.85 from £1, at the same casino. Those two results do not establish the frequency of such awards. The game belongs to Push Originals.
The original jar,Giga Jar and other multipliers
Jammin’ Jars 2 arrived in June 2021: the same grid and hops, instant prizes up to 1,000x, Fruit Blast and Giga Jar. Standard RTPs of 96.83% and 96.40% differ by 0.43 percentage points. In February 2021, James Marshall explained the announcement through continuing positive feedback from players and partners.
| Jammin’ Jars | Jammin’ Jars 2 | |
|---|---|---|
| RTP | 96.83% / 94.25% | 96.40% / 94.40% |
| Top win | 19,998.5x (observed) | 50,000x |
| Free spins | 6 | 6 |
| Random feature | Rainbow | Fruit Blast |
| Extra bonus | — | Giga Jar, 8 Giga Spins |
Fruit Party 2 uses a persistent Wild with a doubling multiplier; Sugar Rush ties multipliers to cells with repeated wins. Here the value rises by one and moves with the jar. Le Bandit is a medium-volatility Hacksaw cluster game. The free spins in slots covers the general feature principle, and the Push Gaming catalogue lists other releases.
