Jammin’ Jars 2 slot review

Jammin’ Jars 2 slot explained

Jammin’ Jars 2 follows Push Gaming’s original Jammin’ Jars, one of the studio’s best-known games. It keeps the 8×8 grid and the jam jar wilds, then adds a collection meter and a new top-level feature called Giga Jar.

Push Gaming is a London studio founded in 2010, licensed by the Gambling Commission and majority-owned by LeoVegas Group (part of MGM Resorts) after a deal announced in May 2023. Its other games are on our Push Gaming slots page.

How cluster pays work on the Jammin’ Jars 2 grid

There are no paylines. Instead, the game pays for a group of five or more matching symbols touching each other on the grid, which is what cluster pays means. An 8×8 grid has 64 positions, so clusters can form in many shapes and directions.

After a win, the winning symbols are removed and new ones fall in from above. That cascade can form a fresh cluster, which removes more symbols, and so on until no new win appears. One paid spin can therefore include several separate wins.

How the features work

The jam jars are the heart of the game. Everything else, from free spins to Giga Jar, builds on what they do.

Moving jar wilds

Jam jar symbols are wilds. After each win they move to a new position and gain +1 to their multiplier. A jar that keeps finding itself in winning clusters during a cascade therefore carries a rising multiplier from one win to the next.

A cascade with a jar, in order

1. A paid spin lands, including a jam jar wild.
2. The jar helps complete a cluster of 5+ matching symbols, and the win is paid.
3. Winning symbols are removed and new symbols drop in.
4. The jar moves to a new spot and its multiplier goes up by one.
5. If another cluster forms, the jar’s higher multiplier can apply; if not, the spin ends.

Free spins

Three or more jar wilds trigger free spins. During the round the jars keep moving, and their multipliers do not reset, so a jar can carry its value across spins rather than starting again each time.

DJ meter and Giga Jar

Gold vinyl symbols you collect fill a DJ meter. When the meter reaches its top level, the Giga Jar feature can trigger. It adds wilds and a large sticky instant-prize symbol for a set number of Giga Spins.

Jammin’ Jars 2 RTP: 96.1% rising to 96.6%

The default version’s RTP is listed as 96.1% rising to 96.6%. Rather than a single number, it is given as a range, so read the game’s rules screen in your app to see how the figure applies to your play and whether the casino runs the default version at all.

Either way, the house keeps a few pence of every pound over the long run. Apps do not carry lower RTP by default, but casinos can choose between versions the studio offers. Our guide to finding a game’s RTP in an app shows where to check.

What high volatility means for a Jammin’ Jars 2 session

High volatility means the game saves much of its return for rarer moments, such as jars with large multipliers or a Giga Jar round. In between, many spins return little. A £20 budget is 200 spins at 10p, 40 at 50p or 20 at £1 if nothing came back, and on a game like this, runs of 20 quiet spins are common.

The 50,000× ceiling shows how top-heavy the maths is. At 10p it equals £5,000; at the £2 cap for 18–24-year-olds, £100,000; at the £5 cap for those 25 and over, £250,000. Outcomes near those figures are extremely rare, and over time the house edge means you should expect to lose.

Jammin’ Jars 2 vs the original Jammin’ Jars

On published figures the original has the slightly higher RTP, while the sequel has a much higher ceiling and the extra DJ meter and Giga Jar layer. If you prefer fewer moving parts, the original is simpler; if you like collection features, the sequel offers more to follow.

Playing Jammin’ Jars 2 on your phone

Jammin’ Jars 2 is an HTML5 game, so it opens inside a casino app or mobile browser on iPhone and Android. Its orientation (portrait or landscape) is not published by the studio. A square 8×8 grid means 64 symbols at once, so each one is small on a compact phone; a larger screen or tablet makes jar multipliers easier to read.

• Get casino apps only from the App Store or Google Play. Our iPhone guide and Android guide explain the checks.
• Search each app’s lobby by name; we cannot confirm which casinos carry this game.
• Keep an eye on battery and data if you play away from Wi-Fi. Our page on casino apps and battery life has general tips.
• If the connection drops mid-cascade, the result is held by the casino’s server, not your phone.

For more on grid games built for small screens, see our explainer on casino games made for portrait mode.

UK rules that apply to Jammin’ Jars 2

In UK apps, Jammin’ Jars 2 runs under the Gambling Commission’s responsible product design standard (opens in a new tab): at least 2.5 seconds between spins, no autoplay, no turbo or slam-stop, and no celebration of returns at or below your stake. Cascades within one spin still play out in full.

Stakes are capped at £5 per spin from age 25 and £2 for ages 18–24, as the Commission’s online slots stake limit guidance (opens in a new tab) explains. Since a Gambling Commission warning in January 2020, feature buy-ins are not offered to British players (the Commission’s games warning for online operators (opens in a new tab) sets out why), so free spins and Giga Jar are reached only through normal play. More detail is on our game design rules page.

Other cluster-pays slots like Jammin’ Jars 2

• Reactoonz: Play’n GO’s 7×7 cluster game, 96.51% RTP, high volatility.
• Sugar Rush: Pragmatic Play, 7×7 grid, 96.50% RTP, high volatility, 5,000× maximum.
• Gemix: a medium-volatility 7×7 cluster slot at 96.83% (lower versions exist).
• Big Bamboo: another high-volatility Push Gaming game with a 50,000× ceiling, on paylines rather than clusters.

Browse every game we cover in our mobile slot reviews.

Jammin’ Jars 2 review: pros and cons

Where to play Jammin’ Jars 2 with a welcome offer

We have no offer linked to Jammin’ Jars 2, and we cannot confirm which partner apps carry it, so check the lobby. These are general slot welcome offers for new customers aged 18+, and terms apply.

• PlayOJO: deposit £10 or more the first time for 80 free spins on Big Bass Bonanza, 10p each, no wagering and winnings paid in cash. Excludes Northern Ireland; designated offer link only.
• Coral Casino: after a qualifying deposit, bet £10 on slots for 100 free spins at 10p on selected games; accept within 48 hours, use within 7 days, no wagering.
• Ladbrokes Casino: spend £10 on slots for 50 free spins a day over 10 days (500 maximum), 10p each on selected games, claim before 23:59 each day, valid 7 days, no wagering.

PayPal, Skrill, Neteller, Paysafe and prepaid card deposits do not count towards the Coral or Ladbrokes offers. Our casino apps with free spins list compares them side by side.

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.