Basic Information
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Slot Review
Step into the gruesome world of Mental from Nolimit City. It’s a place where patients don’t live for long. Because it seems that the goal there isn’t to cure, but to experiment and torture. But players love this slot, and after playing Mental in free mode, you’ll understand why. This dark theme comes along with thrilling gameplay that is packed with exciting features.
Mental Stats: Real RTP, Volatility & Max Win
Slot Stats
We've played over 121.6M rounds in Mental to provide the stats. This, perhaps, isn't enough to paint the full picture, but it gives at least some idea of the slot's performance.
Top Maximum Wins
Over 121.6M spins on the "Mental" slot, the top wins were:
Probability of a Certain Multiplier
The graph shows the probability of getting a multiplier that's higher than a certain value in Mental. Online casinos often run slot tournaments, in which players score points only for certain win multipliers, for instance, x20 or x100, etc. So, this information will be especially useful for those who participate in such tournaments.
Multiplier Distribution
The graph shows the distribution of the multiplier hit frequency. In other words, the probability of different win multipliers to drop. It allows you to estimate the most frequent multipliers in Mental, and how frequently they are awarded during Free Spins.
Multipliers' Contribution to RTP
The figure shows the distribution of returns for different win multipliers. You can see which multipliers contribute more/less to the Mental slot RTP. The information is provided for both the main and bonus games.
Mental Slot Simulator
Find out how the Mental slot behaves when you play tens of thousands spins. What are the chances of getting net winnings, how does the balance change, what payouts land and how often:
Result of Simulations
- Total Spins: 0
- Amount of Bets: 0
- Amount of Bets Return: 0
- RTP Simulation: -
- Number of Bonuses: 0
- Maximum Balance: -
- Max multiplier: -
- In Profit: -
- In Loss: -
- Loss of Entire Balance: -
Mental Slot Overview
The atmosphere is dark and heavy. You don’t want to be anywhere near the place. But once you start spinning reels, you understand the appeal of the slot and the initial emotions will probably fade away although for some sensitive folks the visuals will probably haunt them.
The studio is known for some of its unconventional theme choices, but this slot marked the beginning of a new era, when it really decided to push the boundaries. That’s why it landed in the studios’ Over The Limit category.
Nolimit City slots are usually packed with features, and this one is not an exception. The studio used a range of its xMechanics as well as other features and three bonus games for this slot. So, you can expect an eventful experience in both main and bonus games.
One of the most exciting things about this game is that the x66,666 max win can drop in both base and bonus modes. We know this because we’ve tested the slot extensively and managed to land the top prize even in base mode.
Slot Popularity
This mix of dark, unconventional theme and thrilling gameplay earned the slot plenty of fans. The year it was released, it was 13th in the New Slots category. The following couple of years it landed 26th and 28th in the overall ratings. Our yearly ratings are based on real casino betting data. That’s why there’s no doubt that Mental is the slot that’s been played a lot.
The success of the original inspired the studio for the creation of its sequel in 2025. And for sure, there will be more installments to follow, with each new release boosting the level of insanity.
Mental Online Slot Features
The first thing you’ll notice is an unconventional grid. Initially, it’s 3-2-3-2-3. But those shorter reels 2 and 4 can grow bigger once their Enhancer cells are unlocked. To unlock one of them, there should be 4 Fire Frames, and to have both unlocked, players need 6 Fire Frames.
- What are these Fire Frames? Play a free Mental slot and you’ll notice from the first spins that every spin some positions catch fire. It happens randomly and these are Fire Frames. Every such position will have its symbol split into two for more win ways.
- Dead Patients. There are five patients in this mental facility, but anyone who enters this hospital is destined to pass away quite soon after. And when two deaths happen in a single spin, players get a patient symbol with up to x9,999 multiplier. This isn’t the win multiplier, but the number of symbols packed into one.
- Enhancers, we’ve discussed earlier in this Mental online slot review, don’t just make a bigger grid. They reveal special feature icons, patients or dead patients. So, bigger wins are more likely.
- Transformation. Spider on two shorter reels triggers the process of transformation. And it can turn into higher value or some of the feature icons.
xMechanics
Mental video slot comes with three of the studio’s signature xMechanics. Two of them are there to boost the number of icons a reel can have. xSplit doubles the symbol count per position. xWays triples the icon count per cell but reveals only regular paying symbols. These two can be revealed during Transformation and by Enhancer Cells.
The third mechanic is xNudge. It can’t be revealed by Spider icons. But it can appear when reels 2 and 4 expand. It’s a special Wild that nudges to cover an entire reel. And for every step it takes during the process, it has +1 added to its multiplier. Multiple xNudge icons combine their multipliers.
Mental Slot Bonus Games
Players can trigger one of three bonus features. There’s a basic bonus pack unlocked by a trio of Scorpions. When one Spider joins them, players enjoy some extra features. And when there are not one but two Spiders along with Scorpions, the most advanced bonus is triggered.
Initially, there are 8, 9 and 10 free rounds depending on the level of the bonus. But the bonus can be extended. For every Scorpion or Spider that catches fire when the bonus is triggered, gamblers get +1 to the number of spins.
- Level 1 bonus offers up to 5 Fire Frames in every round. And they are sticky. This isn’t the most eventful feature round, but it still can deliver a thrilling experience. Free Mental online slot mode is there to explore its potential.
- Level 2 bonus offers much more on top of the basic bonus pack. A Spider that helped trigger the feature becomes sticky, which means a higher chance of transformations. Dead Patients store their best multipliers which reset only after being applied to their respective patient images.
- Level 3 bonus offers both Spiders as sticky, meaning guaranteed transformations in every round. And what’s even more exciting is that Dead Patients will have the best multiplier that doesn’t reset and can only increase.
Bonus Upgrades
Entering a less advanced bonus means that landing one or two missing Spiders will instantly upgrade the feature. You’ll get the remaining spins +1 or +2 spins.
My personal experience with bonus upgrades isn’t that good. I didn’t get any upgrades to a better bonus. But you can play a Mental demo slot to see if you are luckier. Thankfully, there’s a feature buy option so that you can launch bonuses instantly.
Game Stats
Nolimit City does provide more stats than most other suppliers, but it still isn’t much. If you want to know more about this game and what to expect from it, check out the detailed stats provided on this page. We’ve made over 121 million test spins to collect the data.
At press time, Mental is 9th most volatile out of over 500 titles on our Slot Stats page. That means it’s very unpredictable within a short period of time. So, the official stats provided by the developer and our research results can greatly vary from your experience playing the Mental demo slot.
- The theoretical RTP is 96.09% but we actually got lucky to have the actual return of 96.47%. Volatility is insanely high, which is confirmed by our extensive research.
- Max win of x66,666 did land. And what will probably be surprising for you is the fact that such payouts landed not only during a bonus game but also in base mode. So, you can really expect a scenario when you don’t even have to trigger FS to win big.
- Hit frequency is 34.19%. Our actual figure is almost the same at 34.18%. That’s almost one in every 3 spins.
More stats are available above on this page. Volatility, hit rate, bonus frequency, the chance of hitting different winnings, etc.
Mental vs Similar Slots
This slot was a massive hit, and it isn’t surprising that the developer released its sequel. Mental 2 keeps the original features and packs even more xMechanics so that things can go absolutely insane. xHole reshuffles icons, xMental turns an entire grid into one massive Fire Frame with special cells revealing boosters. xBet offers more paid options, and with xGOD, players can land the top prize instantly.
In terms of the atmosphere, nothing changes. Players return to the psychiatric hospital to witness barbaric practices and lots of suffering. Both Mental slot machines turned out to be extremely popular. But the studio is to continue this slot series.
Conclusion
Mental offers a unique but disturbing atmosphere of pain and suffering. It has the Over The Limit sticker for a reason. Unusual theme is just part of the appeal, because the slot offers a truly insane gaming experience. Bonus is the highlight of the game, and there are three bonus levels with progressively bigger potential and more actions.
This Mental slot review offers extensive game stats that help better understand what the game offers. You’ll find much more than the official stats Nolimit City provides. But testing the game is the only way to feel it and see if it suits your gaming style.
Slot Rating
Mental Symbols and Paytable
| 5 | x5 |
| 4 | x1.5 |
| 3 | x0.75 |
| 5 | x3.75 |
| 4 | x1.25 |
| 3 | x0.6 |
| 5 | x2.5 |
| 4 | x1.1 |
| 3 | x0.5 |
| 5 | x2 |
| 4 | x1 |
| 3 | x0.45 |
| 5 | x1.5 |
| 4 | x0.9 |
| 3 | x0.4 |
| 5 | x1.25 |
| 4 | x0.75 |
| 3 | x0.3 |
| 5 | x1.15 |
| 4 | x0.65 |
| 3 | x0.25 |
| 5 | x1.1 |
| 4 | x0.6 |
| 3 | x0.2 |
| 5 | x1.05 |
| 4 | x0.55 |
| 3 | x0.15 |
| 5 | x1 |
| 4 | x0.5 |
| 3 | x0.1 |
Screenshots
Mental Slot FAQs
Mental Reviews by Players
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