Jammin' Jars — Play Push Gaming's Disco Classic at JustWOW
Jammin' Jars is one of the most enduringly popular online slots ever made. Push Gaming's 2018 release combines retro fruit symbols, 70s disco visuals and a win potential that few games can match. With a 20,000× max win and 94.24% RTP, it remains a staple in the lobby of every serious online casino — including JustWOW.
On this page we cover everything: game rules, features, how Jam Jar Wilds and multipliers work, free spins mechanics and tips — plus why JustWOW is a great place to play it.
| Game | Jammin' Jars |
| Provider | Push Gaming |
| Released | 2018 |
| Grid | 8×8 (Cluster Pays) |
| RTP | 94.24% |
| Volatility | High |
| Min bet | €0.20 |
| Max bet | €15 |
| Max win | 20,000× bet |
| Free spins | Yes — 6 spins, triggered by 3+ Jam Jars |
| Bonus Buy | Yes — 84× bet |
| Mobile | Yes — all devices |
What Is Jammin' Jars? Game Overview
Jammin' Jars plays on an 8×8 grid using the Cluster Pays mechanic — no traditional reels or paylines. Wins form when 5 or more matching fruit symbols are connected horizontally or vertically.
There are six standard fruit symbols: blueberries, plums, apples, raspberries, oranges and strawberries. Strawberries are the most valuable — a cluster of 25+ strawberries pays up to 100× your bet. After every winning cluster, the winning symbols disappear and new ones drop from above. This cascade mechanic means a single spin can produce multiple consecutive wins.
The visual world is pure 1970s disco — a flashing dancefloor, neon lights and a funky soundtrack that pumps with every win.
Jammin' Jars Features: Jam Jar Wilds, Rainbow and Free Spins
Jam Jar Wild & Multiplier 🫙
The Jam Jar is the most important symbol in the game — it works simultaneously as a Wild and a Scatter.
- Wild: Substitutes for any fruit symbol to help form winning clusters
- Multiplier: Every Jam Jar has its own multiplier starting at 1× that increases with each win it contributes to
- Moving Wild: After each win, the Jam Jar moves one step in a random direction — and the multiplier keeps growing. Multipliers can reach up to 49×
- Sticky in Free Spins: During free spins, Jam Jars stay in place (sticky) rather than moving
This is the engine of the game: multiple Jam Jars on the grid at the same time with high multipliers = explosive wins.
Rainbow Feature 🌈
The Rainbow Feature activates randomly — including on non-winning spins. When the rainbow appears, it drops one or more Giant Fruit symbols (3×3 size) onto the grid. The giant symbol bursts into a cluster that can trigger cascades.
The Rainbow is the game's wild card — it can rescue a losing streak or supercharge an already winning spin.
Free Spins 🎰
Free spins trigger when 3 or more Jam Jars land anywhere on the grid.
- You receive 6 free spins
- The triggering Jam Jars carry over into the free spins round with their current multipliers
- During free spins, Jam Jars are sticky — they stay in place instead of moving
- Multipliers grow with every win and do not reset between spins
- Additional Jam Jars landing during free spins extend the feature and increase multipliers further
Free spins are where the biggest wins happen. Three or four Jam Jars on the grid with high multipliers is the game's peak moment.
Bonus Buy
Don't want to wait for free spins to trigger naturally? Bonus Buy costs 84× your bet and instantly drops at least 3 Jam Jars onto the grid — free spins start immediately. Note: Bonus Buy RTP is slightly lower at 96.49% (vs. 94.24% in the base game).
RTP and Volatility — What They Mean in Practice
RTP of 94.24% is one of the best in the industry. Theoretically, for every €100 wagered the game returns €94.24 over the long run — well above the industry average of around 95–96%.
High volatility means:
- Long stretches without significant wins are normal
- When wins hit, they can be enormous — especially during free spins as multipliers stack
- Recommended bankroll: at least 100–200× your chosen bet size per session
- Not suited to players looking for frequent small wins
How to Play Jammin' Jars at JustWOW
- Log in or register at justwow.com/en
- Find Jammin' Jars in the game lobby or use the search bar
- Set your bet (€0.20 – €15 per spin)
- Hit Spin — fruits cascade onto the 8×8 grid
- 5+ matching fruits connected = a win, cascades begin
- Watch Jam Jar Wilds move and their multipliers grow
- Chase 3 Jam Jars — free spins trigger and the real action starts
Tips for Playing Jammin' Jars
Budget correctly. High volatility demands patience. A bankroll of 100–200× your bet gives you enough spins to reach the free spins feature.
Don't rush the Bonus Buy. At 84× your bet it's a significant investment. Use it when your bankroll allows — it guarantees free spins start but doesn't guarantee big wins.
Watch the Jam Jar positions. During free spins, the position of sticky Jars matters — Jars near the centre of the grid cover more potential clusters than corner positions.
Try the demo first. Understanding how Jam Jars move and how multipliers compound is much easier risk-free.
Jammin' Jars vs. Jammin' Jars 2 — Which Should You Play?
JustWOW also carries Jammin' Jars 2 — the 2021 sequel with even more features. Here's how they compare:
| Jammin' Jars (2018) | Jammin' Jars 2 (2021) | |
|---|---|---|
| RTP | 94.24% | 96.40% |
| Max win | 20,000× | 50,000× |
| Volatility | High | Very High |
| Grid | 8×8 | 8×8 |
| Free spins | 6 spins | Yes |
| Gold Vinyl meter | No | Yes — Giga Jar feature |
| Instant Prizes | No | Yes — up to 1,000× |
| Best for | All player types | High-risk players |
Our recommendation: Start with the original Jammin' Jars — higher RTP, cleaner mechanics, classic experience. Jammin' Jars 2 is wilder and more complex — a natural next step once the original feels familiar.
Why Play Jammin' Jars at JustWOW?
Jammin' Jars is available at hundreds of casinos. Here's what sets JustWOW apart:
✅ Full 94.24% RTP — not a reduced version
✅ Wager-free free spins — winnings paid as cash immediately
✅ Finnish-language customer support — help available daily 10:00–02:00
✅ Tax-free winnings — MGA licence means Finnish players pay no tax on winnings
✅ Fast withdrawals — winnings in your account within 24 hours
✅ Loyalty rewards — playing Jammin' Jars earns iron and gold coins for the rewards shop
Frequently Asked Questions — Jammin' Jars at JustWOW
What is the RTP of Jammin' Jars at JustWOW?
JustWOW offers Jammin' Jars at the full 94.24% RTP — one of the highest available versions of the game. Some casinos run reduced RTP versions without clearly disclosing this.
How do free spins trigger in Jammin' Jars?
Free spins trigger when 3 or more Jam Jar symbols land anywhere on the grid. You get 6 free spins with the triggering Jars carried over. During free spins, Jars are sticky and multipliers accumulate without resetting.
What is the maximum win in Jammin' Jars?
The maximum win is 20,000× your bet. At the maximum bet of €100 that equals a €2,000,000 win. The biggest wins happen during free spins when multiple sticky Jam Jars hold high multipliers simultaneously.
Can I play Jammin' Jars on mobile?
Yes. Jammin' Jars is fully optimised for mobile. It runs on all iOS and Android devices directly in the browser — no app required.
What is Bonus Buy in Jammin' Jars?
Bonus Buy costs 84× your bet and instantly starts the free spins feature without waiting for natural triggers. Note that Bonus Buy RTP is 96.49% — slightly lower than the standard 94.24%.
What does the Rainbow Feature do?
The Rainbow Feature triggers randomly and drops one or more Giant Fruit symbols (3×3) onto the grid. These burst into clusters and can trigger cascading wins. It can activate even on losing spins, giving the game an unpredictable rescue mechanic.
Start Playing — Jammin' Jars Is Waiting at JustWOW
Jammin' Jars has earned its legendary status for a reason. Sticky Jam Jars with climbing multipliers, a rainbow that appears out of nowhere, cascades that just keep going — no other game quite replicates this experience.
✅ Already a JustWOW player? Find Jammin' Jars in the game lobby and start spinning.
🆕 New player? Register and get 20 wager-free free spins instantly — you can use them on Jammin' Jars.
JustWOW Casino — MGA/B2C/522/2018 — Esports Entertainment Limited, Malta. Gamble responsibly. 18+.