Mental Slot (Nolimit City)

The Mental slot begins with 5 reels and 108 ways to win with a 3x2x3x2x3 formation. To land a winning combination, you need to see 3 or more matching symbols from left to right on adjacent reels and beginning from the leftmost reel. Only the highest win per way to win will be won. As you’ll discover further down, there are over 1 billion ways to win.  

Stake vary from as little as 20p a spin to as high as £70 per spin. With high win potential, the max bet may be limited to £5 a spin at some sites. On any device, use the Coins icon to bring up all bet options. Outside the UK, there is are Autoplay and Turbo Mode functions.

The Mental RTP rate is 96.08% which is just above the average for UK online slot games. 58.16% will be for the base game and 37.92% for the bonus features. Nolimit City has also produced a 94.2% RTP version which may be used at some slot sites (check by opening the Paytable).

In the extreme category as far as volatility goes, winning combinations will land, on average, every 2.92 spins as the hit frequency rate is 34.19%. With 3 free spins features, you’ll trigger the Autopsy Free Spins every 220 spins (again, this is an average figure). Other information is provided in the Expert Verdict section. 

The Mental slot game pays out 66,666 times bet max wins. This will be won every 18 million spins (known as the max win probability figure). Known as ‘This is mental’, your chances of winning this significantly increase from the bonus features (more information below).

Chris Taylor

The king of slots

Chris Taylor is an industry veteran originally from Gibraltar. Having worked in the online gambling industry since 2004, Chris loves slots and has reviewed over 10,000 online slot games. Running a slots-focused website for 13 years, Chris is the go-to guy for everything slots-related.

With a horror/mental asylum theme, the Mental slot is set in a mental institute in a part of the country where no one except doctors and nurses dares to visit. Sinister and twisted, it’s classic Nolimit City.

This sepia-toned game is superbly designed and is as creepy and demented as slot games come. Inspired surely by The Silence of the Lambs movie, the harrowing soundtrack will make the hairs on the back of your neck stand up. It’s all brought together by flickering lights that add to the intensity. Full marks to NLC for this visual masterpiece.

On the reels, symbols include low-value organs including skeleton hands, lungs, hearts, brains and eyes which are all in a Victoria sketch style. The higher-value symbols are represented by 5 patients who look possessed. The best symbol is Patient 1 who resembles Hannibal Lecter in his clinical bite restraint mask. 5 in combination awards a 5 times bet payout. Below is a list of symbol payouts:

• Skeleton Hand: 3, 4 or 5 = 0.1, 0.5 or 1 x bet
• Lungs: 3, 4 or 5 = 0.15, 0.55 or 1.05 x bet
• Heart: 3, 4, or 5 =  0.2, 0.6 or 1.1 x bet
• Brain: 3, 4 or 5 = 0.25, 0.65 or 1.15 x bet
• Eye: 3, 4 or 5 = 0.3, 0.75 or 1.25 x bet
• Patient 5: 3, 4 or 5 = 0.4, 0.9 or 1.5 x bet
• Patient 4: 3, 4 or 5 = 0.45, 1 or 2 x bet
• Patient 3: 3, 4 or 5 = 0.5, 1.1 or 2.5 x bet
• Patient 2: 3, 4 or 5 = 0.6, 1.25 or 3.75 x bet
• Patient 1: 3, 4 or 5 = 0.75, 1.5 or 5 x bet

Mental also comes with several special symbols. There is a Skull Wild that substitutes for all paying symbols above. You’ll also encounter Scorpion and Spider Scatters which trigger various free spins features and a Dead Patient symbol which activates the Dead Patient feature. Featuring Enhancer Cells, there are xWays, xSplit and xNudge Wilds. More details can be found below.

Mental Mobile

Nolimit City produces all slots using HTML5 technology. This means their games adapt to whatever device you use. Compatible with desktop, tablet and mobile devices, you can play Mental on iOS and Android smartphones which will display in Portrait Mode. With so much going on, a larger screen (i.e. laptop or PC) would be by preference.

The Mental slot benefits from 8 bonus features. It comes with Dead Patient multipliers up to 9999x, Enhancer Cells which award xWays, xSplit Wilds and xNudge Wilds as well as 3 free spins games with all other extras combined for a terrifying experience.

Fire Frames

On every base game spin, 1 to 13 positions on the reels will randomly get a Fire Frame and will be edged in flames. These symbols then split into 2 parts which increase the number of ways to win and increase your chances of landing winning combinations.

Dead Patient

The Dead Patient feature is triggered when you land 2 Dead Patient symbols simultaneously. Each Dead Patient symbol comes with a random multiplier ranging from 5x up to 9999x. The multipliers then apply when part of winning combinations.

Enhancer Cells

You’ll see Enhancer Cells located at the bottom of reels 2 and 4. They become active if you land 4 and 6 Fire Frames respectively. Each Enhancer Cell will reveal one of the following symbols:

• Patient: 1 of the 5 Patient symbols.
• Dead Patient: A Dead Patient symbol.
• xWays: Reveals 3 symbols of the same type and expands the reel(s) height. It can reveal any symbol except the Scorpion/Spider Scatter or Dead Patient.
• xSplit: It splits 1 symbol on each reel and doubles those symbols as well as splitting itself into 2 wilds.
• Wild: A regular Wild symbol.
• xNudge Wild: The xNudge Wild always nudges to become fully visible on the reel. With every nudge, the win multiplier increases by 1.

For reference, Enhancer Cells are used in other Nolimit City slot games including Apocalypse and Fire in the Hole 2.

Mental Transform 

If you land the Spider Scatter symbol on reel 2 or 4 in the base game, you will activate the Mental Transform feature. The Spider Scatter is transformed into a Patient, Dead Patient, Wild, xSplit or xWays symbol.

Autopsy Free Spins 

The Mental slot benefits from 3 free spins features. First up is the Autopsy Free Spins feature which is triggered by landing 3 Scorpion Scatters on reels 1, 3 and 5 simultaneously during a base game spin. With 8 free spins awarded, each Scorpion Scatter within a Fire Frame will add 1 extra free spin to your tally.

Up to 5 positions on the reels will randomly get a Fire Frame on each free spin. These Fire Frames are sticky for the duration of the feature. You can also upgrade to the other 2 free spins features:

• Lobotomy Free Spins (1 Spider Scatter required): will occur 1 in 10 times
• Mental Free Spins (2 Spider Scatters required): will occur 1 in 10 times

Lobotomy Free Spins

Landing 3 Scorpion Scatters on reels 1, 3 and 5 plus a Spider Scatter during a base game spin will trigger the Lobotomy Free Spins feature. 9 free spins are won, you will get 1 additional free spin for each Scorpion or Spider Scatter within a Fire Frame.

With up to 5 Fire Frames on every free spin, the Spider Scatter is sticky and activates the Mental Transform feature on every free spin.

Look out for Patient symbols as the highest multiplier for each symbol is collected with its ‘Count’. Once collected, the Dead Multiplier is transferred to their respective Patient symbols based on the ‘Count’ when a newly collected Patient symbol appears on the reels. Every time a Dead Multiplier is transferred, the ‘Count’ is reduced by 1.

Finally, landing 2 Spider Scatter symbols will trigger the Mental Free Spins feature. This will occur once every 25 times you play the feature.

Mental Free Spins 

Finally, the Mental Free Spins feature is triggered by landing 3 Scorpion Scatters on reels 1, 3 and 5 plus 2 Spider Scatters during a base game spin. With 10 free spins awarded, every Scorpion or Spider Scatter within a Fire Frame will also give you 1 extra free spin.

With all extras from the Lobotomy Free Spins feature in play, both Spider Scatters are sticky and will award the Mental Transform feature on very free spin. The difference is that the Dead Multiplier count for the Patient symbols do not decrease after its transfer to a Patient symbol. It can only increase when new Dead Patient symbols are revealed.

Nolimit Bonus 

For players located outside the United Kingdom, there is an optional Nolimit Bonus feature. A Bonus Buy element, there are 4 options ranging from 80 to 1,000 times your total bet. Here are all the details:

With the Lucky Draw option, you have a 50% chance of playing the Autopsy Free Spins with a 40% chance of the Lobotomy Free Spins and a 10% chance of the Mental Free Spins.

Mental is one of the most terrifying slot games I’ve ever played. It combines various mechanics through Enhancer Cells, Dead Patient multiplier up to 9999x, 3 free spins features and 66,666 x bet max wins.

For starters, the Mental slot game is as scary as they come. Sinister, demented, dark and grim, it’s no walk in the park. The graphics are terrifying and the soundtrack is intense which creates a unique proposition that will divide slot players. I think it’s superb as it’s a far cry away from the standard witches and ghosts you see in countless ‘vanilla’ horror-themed games.

Using Enhancer Cells, this conjures up plenty of special symbols including xWays (for more ways to win), xSplit Wilds (which doubles symbols and creates 2 wilds) and xNudge Wilds (which expand and nudge to increase the win multiplier). I particularly like the Dead Patient symbols which can result in 9999x multipliers!

Deciphering what is going on is part of the fun in my opinion with things escalating in the 3 free spins features. With guaranteed Fire Frames on every free spin, landing 1 or 2 Spider Scatters will upgrade your feature to the next in line. Dead Multipliers come into play during the Lobotomy and Mental Free Spins with the latter only seeing the count for Patient symbols increase.

With 66,666 times bet max wins available, below is a table highlighting the max win probability from the 3 free spins features. It also pinpoints the odds of triggering the feature from a base game spin. 

Extremely volatile, Nolimit City has combined their xWays, xNudge and xSplit mechanics in a truly terrifying package which isn’t for the faint-hearted. The question is whether you dare enter this sinister asylum in search of an epiphany.

If you want horror-inspired slot games, check out our Halloween slots page. OLBG lists the top 13 slots including various titles by Nolimit City:

• Serial: serial killer theme with 74,800 x bet max wins
• Disturbed: serial killer/doctor theme with 54,391 x bet max wins
• Possessed: based on twisted demons with 50,000 x bet max wins

The Mental slot review was written by Chris Taylor from our OLBG Expert team who has written over 10,000 slot game reviews in an iGaming career spanning over 2 decades. It was then verified/checked by Jenny Mason, our prime Slot reviewer who has 17+ years working in online gambling, top UK brands. 

Jenny Mason

Slots content manager

Jenny Mason has more than 17 years of experience in the online gambling industry and has worked for some of the UK’s top betting brands. She started at OLBG in 2014 and her role involves creating great content and looking after the marketing activity. Jenny is knowledgeable in all areas of online sports betting and has an interest in slots and bingo.