In Jazz by Endorphina is a 5-reel slot that captures the soul of a 1930s jazz club through warm visuals, a live-instrument soundtrack, and a band of characters that double as bonus symbols. Behind the retro charm sits a solid engine — 96% RTP, medium-high volatility, and a free spins mechanic where each musician brings a different Wild multiplier to the reels. It is compact, stylish, and built for players who appreciate atmosphere as much as win potential.
In Jazz transports the player into a smoky Chicago jazz club of the 1930s – the era of swing, upright basses, and velvet vocals. Endorphina released this slot on April 27, 2017, and it still stands out among music-themed machines thanks to its carefully crafted style and respectful approach to jazz culture. The reels bring an entire ensemble to life: a glamorous singer, a smiling bass player, a saxophone player in indoor sunglasses, and a horn player. The lower-paying symbols – card values from 10 through Ace – are also styled to match the era and tied to musical instruments.

| Software Provider | Endorphina |
| Type | Video Slot |
| RTP | 96.06% |
| Volatility | Medium-High |
| Min Bet | 0,25 |
| Max Bet | 200 |
| Max Win | 2500x |
| Reels | 3 |
| Lines | 25 |
| Megaways | No |
| Free Spins | Yes |
| Fast Spin | Yes |
| Bonus Buy Function | Yes |
The 25 adjustable paylines offer flexibility: you can play on the minimum for a test run or activate all lines for full coverage. Coin denominations range from €0.25 to €200, making the slot accessible to cautious players and high rollers alike.
Wild (Golden Treble Clef) – substitutes for all symbols except the Scatter. Landing 3 to 5 on an active payline awards 100 to 1,000 coins. It is one of the most generous base symbols in the game.Scatter (“In Jazz” Logo) – the key to the bonus game. Three or more Scatter symbols anywhere on the reels trigger the free spins round.

The high-paying symbols are the jazz band musicians. The singer, saxophonist, bass player, and horn player pay between 30 and 600 coins depending on the number of matches. Card values (A, K, J, 10) make up the lower tier of the paytable.

This is the slot’s main mechanic. Landing 3 or more Scatter symbols activates a round of 10 free spins. During free spins, three special stacked Wild symbols appear on the reels, each represented by one of the musicians:

This is where the slot’s true potential unfolds: stacked Wild symbols with multipliers can dramatically boost payouts in a single spin. Additional free spins can be retriggered within the bonus, extending the round.

After every win — both in the base game and during the bonus round – you can risk it and double the result. The mechanic is classic: you need to draw a card higher than the dealer’s. You can double up to 10 consecutive times, but a single loss wipes out the winnings.
An additional feature announced by the developer that adds an element of surprise to the gameplay.

The visual design of In Jazz is rendered in warm tones – dim lighting, burgundy curtains, the gleam of brass. Symbol animations are restrained yet stylish: the musicians come alive on winning combinations. The graphics may not dazzle with modern 3D effects, but they perfectly capture the spirit of the era.
The soundtrack is the slot’s strongest asset. The background melody is built on live jazz instruments, and each winning combination is accompanied by a unique musical accent. For a slot dedicated to music, this is a critically important element, and Endorphina has executed it at a high level.
In Jazz occupies a distinctive niche within Endorphina’s portfolio – and the broader online slot market – as a game where theme execution genuinely enhances the mechanical experience rather than merely decorating it. The 1930s jazz club setting is not cosmetic wallpaper; it is woven into the core bonus system through the Jazz Band Joker mechanic, where each musician carries a different multiplier value, creating meaningful variety within the free spins round.
From a mathematical standpoint, the slot sits in a comfortable middle ground. The 96–96.06% RTP is competitive for a 2017 release and still holds up against modern titles. The medium-high volatility profile means the base game can run dry for extended stretches, but the stacked Wilds with 2x and 3x multipliers during free spins provide a credible recovery mechanism. The theoretical ceiling of 2,500x is modest by today’s standards – where 10,000x or even 50,000x caps are increasingly common – but it reflects a more grounded variance model that many experienced players actually prefer for session stability.

The 25 adjustable paylines are worth noting as both a strength and a limitation. On the positive side, line control lets players fine-tune risk exposure – a feature largely abandoned by modern fixed-payline and cluster-pay designs. On the other hand, reducing active lines narrows the hit frequency and can distort the effective RTP downward, which less experienced players may not realize.
Where In Jazz shows its age is in the absence of modern engagement layers: there are no cascading reels, no progressive jackpot tiers, no buy-bonus option, and no persistent state features. The base game relies entirely on standard line wins and the gamble function. For players accustomed to feature-dense modern slots, this may feel sparse. For those who value clean mechanics and predictable session flow, it is a deliberate advantage.
In Jazz is a 5-reel, 3-row video slot by Endorphina with 25 adjustable paylines, set in a 1930s Chicago jazz club. The RTP is 96–96.06% with medium-high volatility. Bets range from €0.01 to €125 per spin, and the maximum win reaches up to 2,500x the total bet.
The Golden Treble Clef acts as the Wild, substituting for all symbols except Scatter and paying up to 1,000 coins. The “In Jazz” logo is the Scatter that triggers the bonus round. High-paying symbols are the jazz band members – Singer, Saxophonist, Bass Player, and Horn Player – while card values A, K, J, and 10 fill the lower tier.
Landing 3 or more Scatters anywhere on the reels activates the Jazz Band Joker round with 10 free spins. During the bonus, three stacked Wilds appear: the Saxophonist (standard Wild), the Bass Player (Wild with 2x multiplier), and the Singer (Wild with 3x multiplier). Free spins can be retriggered within the round.
Yes. After any win you can enter the Risk Game and try to double your payout by drawing a higher card than the dealer. You can double up to 10 times in a row, but one loss forfeits the entire win.
Yes. The slot runs on HTML5 and works in any mobile browser on iOS and Android without an app download. Autoplay and Turbo Spin modes are also available for faster sessions.