Slot guide

Jammin' Jars slot review: jam jar wilds on an 8x8 grid

Push Gaming's 2018 cluster-pays fruit slot, where jam jar wilds stay on the grid and add to their multiplier with every win.

By Eleanor Hartley, editor · Checked on 1 November 2026

The Jammin' Jars slot is Push Gaming's 2018 cluster-pays game on an 8x8 grid. Matching fruit symbols in clusters pay and cascade away, jam jar wilds stay on the grid and add one to their multiplier with each win they join, and a random Rainbow feature drops giant fruit symbols. The listed RTP is 96.83%, volatility is high and the top win is 20,000x the stake.

Jammin' Jars: spec sheet

From the provider's published game sheet.

Provider

Push Gaming

RTP

96.83%

Volatility

High

Max win

20,000x stake

Reels

8

Rows

8

Ways

Cluster pays

Released

2018-09

Features

• 8x8 cluster-pays grid with cascades
• Jam Jar wilds stay and grow their multiplier by 1 per win
• Rainbow feature drops giant fruit symbols
• Free Games where wild multipliers only increase

RTP can be set lower by some casinos; the game's own help screen shows the figure that applies. 18+ only.

Jammin' Jars on an 8x8 cluster grid

There are no reels in the usual sense. Groups of matching symbols that touch horizontally or vertically form a winning cluster; those symbols are removed, the rest fall, and new symbols fill the gaps. A spin continues until no new cluster forms. Push Gaming's grid is larger than most, so wins can come from anywhere on the board.

Jam jar wilds and their climbing multipliers

The jam jar is the game's engine. It substitutes for fruit, and when it is part of a winning cluster it stays on the grid for the next cascade and raises its multiplier by one. Several jars working together can push results up quickly, which is where the high volatility comes from: many spins pass without a jar doing much, and a few produce most of the return.

The Rainbow feature and Free Games

The Rainbow feature triggers at random and drops giant fruit symbols onto the grid, which can complete large clusters in one go. Jammin' Jars also has a Free Games round in which wild multipliers only increase, so the gains carry through the round rather than resetting.

Max win, RTP and the two release dates

Sources vary in the detail. One database gives the maximum as 19,998.5x rather than 20,000x, another's text gives 96.80% rather than 96.83%, and the September 2018 release is dated the 14th in some places and the 18th in others. None of this changes how the game plays, but it is a reminder to read the in-game help screen for the build you are on. The slot volatility guide explains what high volatility means for a session. Jammin' Jars 2 is a separate sequel with its own figures.

How to play Jammin' Jars in the UK: demo and lobbies

To play Jammin' Jars in the UK you need an account at a GB-licensed casino that carries Push Gaming. None of the operators on this site names Push Gaming in the provider facts available here, so check the casino's own lobby by title before depositing. Free play is not embedded on this site; Push Gaming shows its games on its own website, and licensed casinos may offer a demo mode after age verification. The free slots page explains how demo access works in Great Britain. Real-money stakes on online slots are capped at £5 per spin, or £2 if you are 18 to 24.

18+ only. The responsible gambling page lists tools and free support.