Endorphina
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Endorphina started in 2012 and runs from a head office in Malta. Fourteen years on, the catalogue we can see on our data source stands at 231 games, a sizeable back catalogue by the standards of the field.

Only 49 of those 231 carry a dated release on the feed, and the dates that exist reach back no further than 18 September 2024. So the release data is a window on recent output rather than a full history since 2012, and everything below about release pace should be read that way.

Inside that window the pace has climbed: 11 dated releases in 2024, 18 in 2025 and 20 in 2026. The 2024 count covers only the last three and a half months of the year, so the step up from 2024 to 2025 is narrower than the raw numbers suggest. The move from 2025 to 2026 is the real one, with 20 titles landing in roughly seven and a half months against 18 across the whole of the previous year.

The themes on file cluster hard rather than spreading evenly:

• Fruit: 33 games
• Halloween: 17 games
• Horror: 17 games
• Christmas: 13 games
• Asian: 11 games
• Animal: 10 games

Fruit alone accounts for 33 titles, more than any other theme on the catalogue, which fits a studio that has kept a foot in classic-style slots rather than chasing licensed themes. Halloween and Horror add another 34 between them, and with 13 Christmas games the calendar plainly drives a chunk of the release plan.

For a player, that concentration is useful to know up front. If you like fruit machines and seasonal releases you will find a lot here; if you are looking for something outside those lanes, the catalogue is broad enough to hold it, but those six themes are where the weight sits.

Across the 21 titles that publish an RTP on our data source, the median is 96.06% and the average is 96.04%. The studios we track average about 95.7%, so Endorphina sits roughly a third of a percentage point above the field. Median and average landing within 0.02 of each other tells you the middle of the catalogue is tightly packed, with no cluster of outliers dragging the picture either way.

That gap is small per spin and only surfaces over volume. On £1,000 of total stake, a 0.34 point edge is worth about £3.40 in expected return. It is real, and over a long run of sessions it is worth having, but it does not change the shape of the game: a higher RTP slows the rate you lose at, it does not turn a losing proposition into a winning one.

The published figures run from 93.77% to 98.07%, a spread of 4.3 points. That is more than twelve times the advantage the studio's average holds over the field, which is the single most useful thing on this page. Which Endorphina game you open matters far more to your expected return than the fact that it is an Endorphina game at all.

Look at the top of the range and the spread turns out to be lopsided. Fortune Capybara sits alone at 98.07%, nearly two points clear of the next name on the list. Below it the pack closes right up: Power Balls at 96.12% down to Fortune Snake at 96.07% covers seven titles inside a five hundredths of a point band.

One thing to check before you spin. Studios commonly ship the same game at more than one RTP setting and the casino picks which build it runs, so the figure we hold is what the title publishes, not a guarantee of what you will be served. The number in the game's own info screen at the casino you are actually playing at is the one that counts.

Volatility ratings are thinner on the ground: 11 of the 231 games carry one on the 1 to 5 ladder. Four are medium, four very high and three high, and there is not a single low or low-to-medium title among them.

In practice that reads as a floor rather than a lean. Medium is the most common single band, so even the gentlest rated Endorphina games pay in moderate, reasonably regular chunks rather than a constant dribble of small returns. The other seven sit at high or very high, where the maths pushes returns into rarer, larger hits and long stretches with nothing much happening are part of the design, not a sign the game is cold.

The practical read: size your stake for the top of that range, not the middle. A budget that comfortably survives a medium title can disappear in a very high one before the game has had a fair chance to show you its bonus, and with four of the eleven rated games sitting in that band, it is an easy mistake to make when moving between titles from the same studio.

The table below lists the eight highest RTP figures we hold, and one name stands well clear of the rest. Fortune Capybara publishes 98.07%, nearly two points above anything else on file, which makes it the outlier of the set rather than the top of a gradient.

After that the list is effectively flat. Power Balls (96.12%), Clover Flames (96.1%), Janissaries (96.09%), Big Brown and Starshine Crystals (both 96.08%), then Chance Machine 100 Dice and Fortune Snake (both 96.07%) are separated by five hundredths of a point end to end. Choosing between those seven on RTP is not really a choice at all, so pick on theme and on how the game plays instead.

Of the games we track and review ourselves, the newest is Gift of Midas, released on 30 July 2026. That is one title against a catalogue of 231, so treat our reviewed slice as a sample of what the studio is shipping right now, not a survey of the back catalogue.

For context on the wider feed, the newest dated release on file is 13 August 2026 and the oldest is 18 September 2024. Everything we say about release pace is drawn from that window.

Against the 80 studios we track, the numbers line up like this:

• Catalogue size: 231 games, ranking 17th of 80.
• RTP: an average of 96.04% against a field average of about 95.7%, so above the field by roughly a third of a point.
• Field volatility: 21 of the 53 studios we hold ratings for lean very high, so high variance is the norm across the field rather than a quirk of any one studio.
• Volatility here: medium and very high are level on four rated titles each, with three high, so the rated slice is more evenly split than a straight very-high studio.

The honest takeaway is that no single figure is doing heavy lifting. Seventeenth of 80 for size is solidly in the upper third, and a third of a point of RTP is a modest advantage that only pays out over volume. Neither is a headline, and together they describe a studio that is a bit better than average on the numbers rather than an outlier.

Where it does separate itself is breadth and pace. A catalogue of 231 titles with a fruit-heavy core plus a substantial seasonal run, still adding 20 dated releases in 2026, gives you more to work through than most studios we track. For day-to-day play that variety tends to matter more than a decimal point of RTP, provided you check the number on each individual game before you commit to it.

A free demo is the sensible way to meet an Endorphina game for the first time. The demo runs the real game with the real maths and the real features on play money, so you can see how often the base game pays, how the bonus triggers and whether the pace suits you, without staking anything.

What a demo cannot show you is how a game behaves against your own money over a session. Play money has no consequences, so a run of 200 spins with nothing much happening barely registers; the same run with your own stake feels entirely different. That matters here more than usual, because four of the eleven rated Endorphina titles sit at very high volatility, where those quiet runs are exactly what the maths is built to produce. Demo play in Great Britain is 18+, and sites will age-verify you before the game loads.

Modern slots are built mobile-first and then scaled up for desktop, so an Endorphina game on a phone is the same game rather than a cut-down version of it. The demos run in the browser, so there is no app to install.

The UK rules travel with the game, not the device. The 2.5-second minimum spin time, the ban on autoplay and the stake caps are tied to the British build of the game, so they apply on a phone exactly as they do on a desktop.

The statistics on this page come from the Endorphina catalogue on our data source, and each figure is computed only from the titles that actually publish it. That is 231 games for catalogue size, 49 for the release dates, 21 for the RTP figures and 11 for the volatility ratings, so the RTP picture covers roughly a tenth of the catalogue and the volatility picture roughly a twentieth. Max win is not covered here, because the source is not reliable on it.

The reviews are a separate thing. Those come from the individual releases the desk plays, which today is one tracked Endorphina title, and we do not claim to have played the catalogue. When the underlying data changes, the figures here change with it.