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Review, Demo Play, Payout, Free Spins & Bonuses

Nitropolis is an online slot developed by ELK Studios that features expanding symbols that can trigger over 85 million winning ways. Features include free spins, respins and sticky symb...ols. The RTP of this high volatility slot is 96.1% and its top prize is worth 10,000x.

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  • 10,000x top prize
  • Super fun theme
  • Loads of bonuses on offer
  • Nitro reels can trigger over 85 million winning ways
  • Complex gameplay
  • 96.1% RTP could be higher

Theme and Graphics

We love it when an online slot has a narrative, and you don’t get much more story-driven than ELK Studios’ Nitropolis slot. This game has such an interesting storyline, as it takes place in a dystopian setting where there are only four species left, and they have broken off into their own gangs: the Rogue Rats, the Pug Thugs, the Gritty Kitties and the Dirty Dawgs. If those names aren’t enough to get you on board playing, I don’t know what will.

On top of this, it’s just a great-looking game. The poker symbols are designed to look like paint splatters and each of the characters has their own interesting personality. There’s also a fun soundtrack playing in the background that fits with the dystopian theme.

RTP and Variance

The RTP (return to player) of Nitropolis is 96.1%. It’s also a high volatility slot that provides a top prize of 10,000x.


How to Win

Winning combinations in ELK Studios’ Nitropolis slot are triggered by landing three or more matching symbols on adjacent reels. This is a very simplified version of how things work, because there are expanding symbols called Nitro Reels that can lead to the game having up to 85,155,840 winning ways.

Nitro Reels and Respins

Nitro Reels can appear on any spin, and in any position on the reels. When this happens, a single symbol will cover two vertical positions and contain 4, 6, 8, 10 or 12 symbols – which means you’re going to have a lot of symbols in your winning combinations. This is a bit similar to the feature you’ll find in Nolimit City’s Punk Rocker.

Respins Feature

Whenever you hit any win, you’ll be given a respin. If there are Nitro Reels active during a respin, there is a chance that the number of symbols in the reel will be upgraded for bigger wins. If your respin doesn’t lead to another win, you may get a Second Chance, where your Nitro Reels respin.

Free Spins

When you land three or more bonus symbols, you’ll trigger the free spins round. You can win between 10 and 25 free spins.

Before the bonus begins, one symbol is selected. This symbol will then award scatter pays, which helps to boost your overall win total during the bonus.

When you’re in the free spins round, Nitro Reels will remain sticky. This means that the symbols inside the Nitro Reels will spin but you’ll always have the same number of additional symbols in that reel.

With the sticky Nitro Reels, you’ll see all sorts of upgrades, respins and second chances going off at once. It’s a little bit overwhelming but it’s fun to see so much activity at once.

Max-win 10,000x
Volatility High
Top RTP 96.1%

Overall Review

Reading over this review, Nitropolis sounds like a bit much – but, all you really need is a few spins to get to grips with things. The whole concept of Nitro Reels is difficult to put into words, so you really have to see it to believe it.

ELK Studios’ Nitropolis slot has lots going for it, as it not only has some great bonus features on offer, it’s also a fun game with an entertaining theme.

So often, we see high variance slots that don’t really hold our attention in between wins because we’re just waiting around for something interesting to happen. This really isn’t the case in Nitropolis, as you have loads of interesting features going off, usually at the same time.

It also helps that there an impressive 10,000x top win available. Plus, the more than 85 million potential winning ways is pretty fantastic. You can tell ELK is getting competitive with other developers – for example, irondog’s 1 Million Megaways BC has over 1 million winning ways and Slot Vegas Megaquads has over 16 million. So, Nitropolis is definitely the kind of high-energy slot that will appeal to thrill-seeking players.  

Other Slots You Might Enjoy...

If you're overwhelmed playing Nitropolis, you might want to scale it back a little with some slots that feature a bit more simplified gameplay, like:


In Yggdrasil’s Pop series of games, ways to win expand as you land winning combinations in the game. Each reel will show more symbols, which ultimately increases how many winning ways are available. The newest game to feature this mechanic is CherryPop.

1 Million Megaways BC

This is one of the only games in the online slots market that offers nearly as many winning ways a Nitropolis. In 1 Million Megaways BC’s free spins round, an extra reel is added to provide you with 1,058,841 ways to win.


Disclaimer: Nitropolis trademark / license is owned by ELK Studios. This site is not endorsed by ELK Studios.

Slot Data
Slot Name: Nitropolis
Software: ELK Studios
RTP: 96.1%
Volatility: High volatility
Paylines: 85155840
Reels: 6
Min Bet (all lines covered): £0.20 (GBP)
Max Bet: £100 (GBP)
Top Win: 10000
Features: Respins, Expanding Reels, Wild Symbol, Scatter Symbol, Free Spins, Sub Symbols In Feature, High volatility, 6 Reels, Scatter Pays
UK Available in UK? Yes. ELK Studios have a UKGC license and are allowed to offer their games at UK licensed casinos.

Nitropolis Slot FAQs

When will Nitropolis be released?

ELK Studios' Nitropolis slot will be released at online casinos on November 3rd.

How do Nitro Reels work?

Nitro Reels are special symbols that occupy two spaces and can display up to 12 symbols at once.

What other ELK Studio slots do you recommend playing?

As far as games with expanding reels go, we always recommend the hugely popular Ecuador Gold slot. If what you're after is a quirky, action-packed theme, then Platooners is the way to go.

What is the RTP of Nitropolis?

Nitropolis has a payout percentage of 96.10%

Is there a free spins bonus in Nitropolis?

Yes, you can trigger up to 25 free spins initally by landing bonus symbols, where Nitro Reels remain sticky.

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    Overall score: 3.1 out of 5 stars
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