YGGDRASIL
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Written by: Filip Gromovic Reviewed by: Nashon Khamala
Play free Yggdrasil slots right here – no download, no account, no registration required. Since 2013 the studio has shipped 250+ titles across 5-reel video slots, progressive prizes, lotto, video keno, and instant-win formats. What sets it apart is a suite of patented mechanics – including patented reel features – that rivals have paid to license or quietly copied. Hit any game in the grid above to spin for free, or keep scrolling for the return-rate numbers, variance ratings, a full GEM breakdown, prize history, the YGS Masters partner list, and where things stand for US players.
| Founded | 2013 |
| Headquarters | Kraków, Poland (offices in Malta, Gibraltar, and the US) |
| Number of Games | 250+ |
| Game Categories | Slots, Table Games, Jackpots, Instant Win |
| Licenses | MGA, UKGC, Isle of Man Gambling Supervision Commission, Gibraltar RGA |
| Typical RTP Range | 96.0% – 97.1% |
| Typical Volatility | Low to High |
| Biggest Jackpot Paid | $8.5 million (Joker Millions, 2018) |
Yggdrasil Gaming launched in 2013 and runs out of Kraków, Poland. It holds licences from the Malta Gaming Authority, the UK Gambling Commission, the Isle of Man Gambling Supervision Commission, and the Gibraltar Regulatory Authority, and it operates across 28 regulated markets. The name everyone knows it by is GEMs - Game Engagement Mechanics - a set of 10 patented reel features that includes Gigablox, split-symbol, and GigaRise. Through the YGS Masters program, partner studios build on Yggdrasil's tech stack and push their games out through its certified network.
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A constantly updated list of the great American online casinos that have Yggdrasil casino slots. This casinos are sorted based on our rating and quality of their
current bonuses. We only show casinos that accept players from your location.
18+, T&Cs apply. Casino list updated: September 2026.
Fredrik Elmqvist started Yggdrasil Gaming in 2013, coming straight off a stint as CEO of the predecessor company. The MGA licence landed in 2014, and the first titles - Winterberries, Nirvana, and other early titles - arrived inside those opening two years. The studio built everything in-house early on, then opened the doors to outside talent through its YGS Masters program. And in 2018, a single progressive spin paid out $8.5 million - still one of the biggest documented single-provider wins the industry has on record.
The name comes from Norse mythology - Yggdrasil is the ash tree that ties the nine worlds together. That mythology-and-adventure leaning shows up all over the catalogue, with graphic animation quality that stands out on desktop and mobile alike. The YGS Masters partnerships have since pushed the library into Asian themes and plenty else besides.
The licence stack covers the MGA, UKGC, Isle of Man GSC, and the GRA, including the UK as a core market, with active operations across 28 regulated markets including Romania. On the trophy shelf: Casino Provider of the Year at the 2022 Gaming Awards, Slot Provider of the Year in 2021, and Innovator of the Year in 2023. Go back further and there's the Software Rising Star award at the 2015 EGR B2B Awards - early recognition for a provider barely two years old at the time.
Every title is built in HTML5 using the iSENSE framework, so it runs in any modern browser on desktop and mobile - no plugins, no downloads. The GATI toolkit (Game Adaptation Tools & Interface) is the standardised kit that gets titles certified and pushed across the partner network quickly. BOOST handles the promo side: sites can drop tournaments, cash drops, and missions straight into their games, and they don't have to build any of it themselves.
The list below covers popular titles suited to different types of players - prize-pool chasers, high-return grinders, feature-heavy bonus rounds, and easygoing medium-variance play. These are the popular games that get played the most, picked on the strength of their design, their mechanics, and what players actually say about them in terms of hit frequency and bonus quality. One caveat: the return figures here are published maximums, so always check the in-game info panel for the number your site is actually running.
Five prize tiers on a 5×3 grid, with a dedicated bonus round that awards free turns - line up five matching diamonds and the prize is yours. It has the highest published return you'll find in this studio's networked-prize lineup.
Each Viking fills a Rage Meter during base play, and those meters unlock persistent sticky substitutes once the bonus kicks in. It's the most-streamed release out there - big win ceiling, but the variance runs hot.
Tops the catalogue at 97.1% - one of the highest fixed return rates any major provider publishes, full stop. The Twister bonus stacks expanding symbols, respins, and wins that build on each other with a growing multiplier.
Oversized symbol blocks up to 4×4 sit across a 6×4 grid with 4,096 ways to win, and the bonus round lets those blocks stretch to a full 6×6. If you want to see the big-block mechanic at full stretch, this is the title - and it looks the part too.
Scatter symbols crack open new positions as you play, widening the grid and the win potential on the fly. Expect respin chains, extra lives, and cascading dropdown wins. High variance, 96.2% return.
A level-progression slot - clear a level and you pick your reward: more spreading substitutes or bigger win values. Medium variance, 30 paylines, 96.1% return. It's the softest landing for anyone who wants to play Yggdrasil titles for free before putting real money down.
The patented Game Engagement Mechanics live inside the GATI stack. Partner studios in the Masters program can license them for their own titles, which is why you'll spot the same features in releases from Dreamtech, 4ThePlayer, and Bulletproof Games - not just first-party slots. The upshot for players is that these amazing features stay recognisable no matter whose logo is on the loading screen. The table below ties each mechanic to the title it debuted in and spells out what it actually does mid-spin.
| GEM Feature | First Appeared In | What It Does for the Player |
|---|---|---|
| Gigablox | Lucky Neko Gigablox | Big symbol blocks, anywhere from 2×2 up to 4×4, drop onto expanded grids. Hit the bonus and they can stretch to 6×6, which is where the per-spin potential really opens up. |
| Splitz | Temple Stacks | Mystery symbols land, then split into copies of themselves - up to 12 on one position. That's how you get 15-of-a-kind hits and as many as 200,000 ways to win on a single spin. |
| GigaRise | Atlantean GigaRise | Columns grow taller when trident bonus symbols show up. Fully expand a column that's carrying a trident and you're paid a prize tier - up to 5 of them, all networked. |
| DoubleMax | Raptor DoubleMax | Value-carrying substitutes double their worth every time they help land a win, and those values keep climbing across a single feature round. Compounding, basically. |
| MultiMax | Multifly! | Several win-value spots stay live on the grid at once, and each one stacks with the others to build a combined value on the same spin. |
| Energy Meter | Energy Meter (debut) | Every win from a substitute feeds a power meter. Fill it and the meter dumps a high-value bonus symbol onto the grid for your next spin. |
| Symbol Fight | Symbol Fight | Substitute symbols actually brawl on the grid, and the fight sequence decides the outcome - stacking values onto whichever symbols are left standing. |
| TopHit | TopHit | A top-row meter quietly collects symbols spin after spin. Fill it and you trigger a top-row win that pays on its own, separate from the usual lines. |
| FastPot5 | FastPot5 | A quick-hit prize system with five tiers, any of which can land on any spin. The lower tiers come around often; the top one is seeded and keeps growing until someone takes it. |
| DuoMax | DuoMax | Two value substitutes run on the grid at once. Get both on the same line and their values multiply instead of adding up - which is where things can get silly. |
You'll find these mechanics in first-party titles and in the independent releases distributed through YGS Masters alike. When a partner title like Lucky Neko uses the big-block mechanic, it's the exact same certified version any studio-branded slot uses - no watered-down copy. The Jokerizer respin mode, available on select legacy titles, adds another layer by letting players bet their wins on a high-risk respin for bigger returns. For more on how these systems work, check our guides to cluster pays slots and Megaways slots.
Yggdrasil runs a prize network that spans several titles at once. The pools fill from every participating site, and the tiers stretch from small daily awards up to multi-million-dollar top prizes. That $8.5 million progressive hit back in 2018 still gets quoted more than almost any other progressive win in the business. Here's where the major networked titles stood recently.
| Prize Tier | Game | Approx. Current Value | Avg. Win | Hit Frequency |
|---|---|---|---|---|
| Legendary | Jackpot Raiders | €21,700+ | €5,000+ | ~2 weeks |
| Ancient | Jackpot Raiders | €2,100+ | €2,000+ | ~2 weeks |
| Yellow Diamond | Holmes and the Stolen Stones | €1,300+ | €1,800 | ~1 day |
| Red Diamond | Holmes and the Stolen Stones | €1,000+ | €585 | ~8 hours |
| Mythical | Jackpot Raiders | €1,500+ | €2,100 | ~7 days |
| Rare | Jackpot Raiders | €471+ | €591 | ~1 day |
| Archmage | Ozwin's Jackpots | €2,700+ | €3,000+ | ~3 weeks |
Every tier here is fixed-seed - the figure you see is the seed plus whatever the network has piled on since the last win. That's the key difference from a hard-capped max win: there's no published ceiling, and the prize just keeps growing until someone lands it. For how this stacks up against fixed-max providers, see our progressive slots guide.
Published returns sit between 96.0% and 97.1% across the standard catalogue - one of the tighter, higher bands you'll get from a major provider. The table below sorts a handful of representative titles by risk level, so you can match a game to how you actually like to play. If the return percentage is the only number you care about, our full highest RTP slots list goes wider.
| Slot | Return Rate | Volatility | Key Feature |
|---|---|---|---|
| Tut's Twister | 97.1% | Medium | Twister expanding symbols + respins |
| Ozwin's Jackpots | 96.7% | Medium | 5 prize tiers, Spellbook bonus |
| Fruitoids | 96.7% | Medium | Respins, win values, space fruit theme |
| Holmes and the Stolen Stones | 96.8% | Low | 5 networked prize tiers, bonus spins |
| Wild Robo Factory | 96.4% | Medium | Free spins, respins, robo substitutes |
| Champions of Rome | 96.4% | High | Free spins, Bonus Buy available |
| Vikings Go Berzerk | 96.1% | High | Rage Meters, persistent sticky symbols |
| Valley of the Gods | 96.2% | High | Expanding grid, extra lives, dropdown wins |
| Gator Gold Gigablox | 96.0% | High | Big blocks up to 6×6 in free spins |
| Alchymedes | 96.1% | Medium | Level progression, spreading substitutes |
Picking by payout style is simple enough. If you're chasing long-term return per spin, start with Tut's Twister (97.1%) or Holmes and the Stolen Stones (96.8%). If you'd rather swing for a big single session and can stomach high variance, Vikings Go Berzerk or the expanding-grid title are the picks. And for an uncapped prize ceiling, anything in the Holmes or Raiders network fits. Test any of them as free slots on this page before you play for real at an online casino.
The YGS Masters program hands independent studios the full toolkit - GATI certification tools, the BOOST promo engine, and whichever GEM mechanics they license. Yggdrasil keeps sole distribution rights over everything that comes out of it. In practice, that means a site running a Yggdrasil integration doesn't just get the newest first-party slots; it gets the partner-studio releases below too, all riding the same certified platform. And the quality bar set for in-house titles carries over to every game in the network.
Builds heavily interactive 3D slots aimed at Asian-theme players while keeping European compliance intact. Runs licensed GEM mechanics and its own proprietary PopWins cascade system. The partnership has turned its catalogue into one of the stronger corners of the whole network.
A newer name with the keys to the BOOST promo tools. The focus is sharp, high-fidelity art direction on Asian themes. Its games qualify for BOOST tournaments and missions at participating sites from launch day.
A UK studio working with GATI plus the big-block and compounding-value mechanics. Known for ditching the standard 5-reel 3-row layout in favour of odder designs. Where available, its titles plug into the prize network, and its releases tend to draw the high-variance crowd.
Built around a crew of international maths specialists. It uses GEM mechanics and co-develops titles hands-on - Hammer of Gods was one of those joint efforts. The reputation is for genuinely detailed probability work in the bonus rounds, not just bolting on borrowed features.
Yggdrasil is live in 28 licensed jurisdictions. In the US, whether you can play comes down to state regulation and which operator platforms have signed on - the titles show up at licensed sites in New Jersey, Michigan, Pennsylvania, and West Virginia, contracts permitting. Demo play on this page works anywhere. Wherever you land, stick to an operator holding a current licence - that's the part that keeps you protected. You can also play for real at any of the best online casinos listed below.
Games available at licensed platforms in NJ, MI, PA, and WV, though it varies by contract. Our US casino guide tracks the current options.
The full catalogue is on tap at MGA- and UKGC-licensed sites, with BOOST tournaments running at participating platforms. One catch: Bonus Buy and bonus offers change from one jurisdiction to the next.
Every title on this page loads straight into demo mode - no signup, no deposit. Use the free spins to get a feel for return rate, variance, and the bonus features before any real money is on the line.
A constantly updated list of the great American online casinos that have Yggdrasil casino slots. This casinos are sorted based on our rating and quality of their
current bonuses. We only show casinos that accept players from your location.
18+, T&Cs apply. Casino list updated: September 2026.
For state-specific options: Michigan · Nevada · Connecticut · all real money casinos.
The real rivals are NetEnt, Hacksaw Gaming, Nolimit City, and Play'n GO - the other studios that lead on themes, mechanics, and reach in licensed jurisdictions. The table below sticks to what matters once you're actually in a session: return range, risk profile, prize availability, proprietary mechanics, and US access. Knowing where Yggdrasil sits against that group is the difference between picking a game on purpose and picking one at random. Titles like Casino Zeppelin and Super Heroes Slot chase a similar crowd from elsewhere in the market.
| Category | Yggdrasil | NetEnt | Hacksaw Gaming | Nolimit City |
|---|---|---|---|---|
| Founded | 2013 | 1996 | 2018 | 2013 |
| Typical return range | ~96.0–97.1% | ~95–97% | ~88–96.5% | ~94–96% |
| Risk profile | Low to High (broad mix) | Low to High (broad mix) | High to Very High | Very High (xPays) |
| Prize network | Yes - multi-title, up to $8.5M paid | Yes - Mega Fortune, Hall of Gods | No networked prizes | No networked prizes |
| Proprietary mechanics | 10 GEMs (big-block, split-symbol, DoubleMax…) | Avalanche, Cluster Pays, Megaways (licensed) | Stackways, Cluster Pays, Expanding Boosters | xNudge, xBomb, xPays series |
| Partner studio program | Yes - YGS Masters (4+ active studios) | No | OpenRGS (content distribution) | No |
| Bonus Buy availability | Selected titles; restricted in UK | Very limited | Most titles | Most titles |
| US access | NJ, MI, PA, WV (varies) | NJ, MI, PA (varies) | NJDGE certified | Limited, varies |
| Best for | Prize hunters, return-focused players, medium-range sessions | Brand recognition, broad game range, networked prizes | High-variance hunters, Bonus Buy users | Extreme variance, highest theoretical ceilings |
Here's what sets Yggdrasil apart: it's the only name in this group running both a live prize network that pays multi-million wins and a documented set of 10 licensed GEM mechanics that partner studios can actually use. The Mega Fortune network pays bigger up top, but that provider has nothing like the YGS Masters pipeline. Hacksaw and Nolimit both push higher variance ceilings, yet neither has a prize network or a partner ecosystem. Want the provider-by-provider view? See our Hacksaw slots page, Net Ent slots page, and Pragmatic Play slots page.
In licensed jurisdictions, Yggdrasil is obliged to bake responsible gambling tools into every title. It also trains its staff on responsible play and puts money into GambleAware each year. Before any game ships, independent testing houses - eCOGRA and BMM among them - certify its random number generator for fairness. No new title goes live until it clears that same bar.
Real-money play means the platform verifies your age first - no exceptions. The demo on this page skips all that and runs on virtual credits only.
Under MGA and UKGC rules, licensed sites running these games have to serve up session-time reminders and reality-check prompts at intervals you can set yourself.
You can self-exclude straight through any licensed platform. It covers the full catalogue, not just one title - it's all or nothing.
Current prize values show in real time inside the game on every networked title - that's a transparency requirement written into MGA and UKGC agreements, not a nicety.
Every title runs a certified random-outcome generator that's independently audited before release. The return figures get verified and published, title by title, in the paytable.
If gambling is taking a toll on you or someone close to you, free help is there at BeGambleAware.org and the National Problem Gambling Helpline on 1-800-522-4700.
The demo here runs on virtual credits - nothing real is on the line. If you do move to real money, set a session budget before the first spin, switch on deposit limits, and treat slots as entertainment, not a paycheck. For more, see our responsible gambling guide.
They're online casino games made by Yggdrasil Gaming, a studio that's been going since 2013. It's licensed by the MGA, UKGC, Isle of Man GSC, and the Gibraltar RGA, and it operates in 28 licensed jurisdictions. What it's known for is GEMs - 10 proprietary features like the big-block feature, split symbols, and DoubleMax - and a multi-title prize network that once paid out $8.5 million in 2018.
Yes. Every title here runs in demo mode - no download, no account, no deposit. Demo play uses virtual credits, so there's nothing real to win. Still, it's the most practical way to see how the return rate behaves, how often bonuses trigger, and how the free spins play out before you put real funds down.
Depends what you're after. Highest return goes to Tut's Twister (97.1%). For networked-prize play, it's Holmes and the Stolen Stones (96.8%, 5 tiers). Want to see the big-block mechanic at full stretch? Gator Gold (up to 6×6). For deep bonus features, Vikings Go Berzerk with its Rage Meters and sticky substitutes. And for medium-variance beginners, Alchymedes (level progression, 96.1%). You can spin all of them for free right here - pick whatever suits your style and hit Play Free.
GEMs - Game Engagement Mechanics - are 10 patented features built in-house and then opened up to partner studios through YGS Masters. The list runs the big-block feature (oversized blocks up to 6×6), the split-symbol feature (symbols split into copies, good for 15-of-a-kind wins), DoubleMax (value substitutes that double each time they help win), the column-growth feature (columns that grow taller and trigger prizes), and the compounding-value feature (several compounding values at once). Each one debuted in a specific title and has since spread across partner releases.
Tut's Twister sits out front at 97.1% - one of the highest published figures for a fixed-return video slot from any major provider. Holmes and the Stolen Stones comes next at 96.8% in a networked-prize format. Ozwin's Jackpots and Fruitoids both land on 96.7%. Beyond those, most titles publish somewhere between 96.0% and 96.8%.
Yes - titles run at licensed casinos in New Jersey, Michigan, Pennsylvania, and West Virginia, contracts permitting. Free demo play works no matter where you are. On sweepstakes or social platforms, it comes down to the individual site. For the current US-licensed lineup, see our US casinos page.
It's the YGS (Game Server) Masters program - a platform that opens up the full tech stack to independent studios: GATI certification tools, the BOOST promo engine, and licensed GEM mechanics. Yggdrasil keeps exclusive distribution rights for all Masters content. Partner studios include Dreamtech, Bulletproof Games, Peter and Sons, and others. For you, it means a casino with a Yggdrasil integration carries those independent releases right alongside the first-party catalogue, all on the same certified platform.
Yes. There is a networked prize system covering several progressive titles at once. The lineup includes Holmes and the Stolen Stones (5 tiers, bonus spins included), the Raiders title (5 tiers, Forgotten up to Legendary), and Ozwin's series (5 tiers, Novice up to Archmage), and Empire Fortune (a 3-tier wheel). The biggest single payout on the books is $8.5 million, paid on Joker Millions in 2018.
BOOST is the built-in promo engine - the thing sites use to run tournaments, missions, leaderboards, and cash drops right inside compatible titles, with no separate integration to build. If you're playing an eligible game at a platform that's switched BOOST on, you're entered automatically. The events show up in the interface and usually run on short windows - daily, weekly, or tied to a specific event.
Alchymedes is the softest landing - medium variance, 96.1% return, a clear level-progression bonus, and 30 lines you can follow without untangling a mess of feature chains. If you'd rather chase the highest published return in a simple package, Tut's Twister (97.1%) is the swap. Both are in free demo on this page. For networked prizes without steep swings, Holmes and the Stolen Stones (low variance, 96.8%) is the friendliest of the progressive titles. The high-energy stuff in the Berzerk mould is better left to players who don't mind long dry spells.
Filip Gromovic is a senior slots reviewer here at FreeSlots99 with over five years of experience evaluating the latest drops in the world of iGaming.
Being a slot fan himself, Filip approaches slot ratings just the way we like it – professionally, but also from a player’s standpoint.
That enables him to give his unbiased take on the slot’s features, gameplay and design, while only recommending top-tier releases to our readers.
More info on Filip Gromovic
Having served FreeSlots99 for more than 5 years as a senior content editor and reviewer, Nashon Khamala has extensive knowledge in game slots and iGaming.
His membership in the Editorial Freelancers Association helps him deliver content that reaches both editorial excellence standards and an engaging information level.
By using his expertise in slots games combined with player-focused analysis, Nashon delivers a professional evaluation of slot features and player experiences in his reviews.
More info on Nashon Khamala
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