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Nitropolis Slots: The Full Series (2026)

Welcome to Nitropolis, a post-apocalyptic city where four rival animal clans fight tooth and claw for control over a mysterious green fuel known as Nitro! Created by ELK Studios in 2020, the Nitropolis slots combine immersive storytelling with explosive gameplay mechanics, with potential maximum wins reaching up to 50,000x your stake. This page will explore every Nitropolis slot to date, comparing RTPs, volatility, bonus features, and the best casinos to experience this 10-game franchise.
Last Updated: 30 Oct 2026
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The Nitropolis Series So Far

When it comes to slot series and franchises, no provider does it better than ELK Studios!

In 2020, the Swedish-based studio introduced players to the world of Nitropolis, an online slot series following a post-apocalyptic city ruled by four warring animal clans: the Dirty Dawgs, the Gritty Kitties, Rogue Rats, and Pug Thugs.

It blends chaotic storytelling with elaborate mechanics, as the four factions fight for control of Nitro, the green fuel that’s become the city’s most valuable resource.

Beyond the cast of quirky characters, the series is defined by the Nitro Reels mechanic, with expanding grids, respins, and elaborate bonus modifiers.

Here is the entire Nitropolis slot series in release order.

If you’re looking for the Battle of Nitropolis slots, you can find them further down this page, which ELK Studios launched as a separate campaign in 2024 focused on each of warring factions.

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Nitropolis – November 2020

Nitropolis is all about a lawless, post-apocalyptic city where four rival animal gangs battle for control of a mysterious green fuel known as Nitro! ELK kicked things off with a six-reel slot featuring 4,096 ways to win, expandable to 85,155,840 ways through its Nitro Reels mechanic. These reels can upgrade to reveal additional matching symbols or activate respins. With a 96.10% RTP, high volatility, and 10,00x max win, the original Nitropolis started things with a bang.
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Nitropolis 2 Slot Logo

Nitropolis 2 – April 2021

Building on its predecessor’s expanding Nitro Reels mechanic, Nitropolis 2 released just a few months later, bringing something new to the formula: the Nitro Booster, capable of activating eight different modifiers. The number of ways to win also jumped up to 191,102,976 ways. Despite these additions, the maximum win remained at 10,000x your stake, while the commonly listed RTP dropped to 95%, with a medium-high volatility maths model running the show.
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Nitropolis 3 – April 2022

They say the best things come in threes, and Nitropolis 3 is largely considered as the game that put the series on the map. It raised the theoretical payout ceiling to 50,000x your stake, while maintaining the highly-volatile maths model and fixed 95% RTP. The six-reel grid could expand vertically from four to eight rows, while Big Symbols, Avalanches, and Redrop features added more flexibility. Up to 20 Free Spins could be awarded, depending on the number of triggering Scatters.
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Nitropolis 4

Nitropolis 4 – February 2023

Nitropolis 4 is one of the most feature-packed games in the series, cramming the six-reel grid with expanding rows, Big Symbols, Nitro Multipliers, and eight Nitro Booster modifiers for loads of potential combinations. The Free Spins Bonus features sticky Nitro Reels, while the Super Bonus Game starts with the max grid height and Pays Both Ways. With up to 262,144 ways to win, a 94% RTP, and a max payout of 50,000x, Nitropolis 4 offers plenty of mechanical complexity.
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Nitropolis 5 – July 2024

Following the events of the Battle of Nitropolis spin-offs (more on that below), all-out war has arrived. Nitropolis 5 brings the five-part main series to its explosive conclusion, as the animal clans confront Sergeant Nitro Wolf and reclaim their city. This instalment combines familiar Nitro Reels and Avalanches with 11 Nitro Booster modifiers, NPD Holding Cells and a Boss Battle feature. With a 94% RTP, high volatility, and 50,000x maximum win, Nitropolis 5 is a fitting finale.
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Battle of Nitropolis Spin-Off Slots

Gritty Kitty of Nitropolis Slot 1

Gritty Kitty of Nitropolis – February 2024

The claws are out in Gritty Kitty of Nitropolis, which follows the feline faction on a mission to recover the mysterious Golden Shuriken. the game gives the Gritty Kitties their own distinctive setting and collection of Nitro-powered features, with modifiers and bonus gameplay adding extra unpredictability to the action. Featuring a 94% RTP, high volatility and a maximum win of 25,000x your stake, it’s a fun introduction to the Battle of Nitropolis chapter.
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Rogue Rats of Nitropolis Slot Logo

Rogue Rats of Nitropolis – March 2024

Rogue Rats of Nitropolis is the biggest departure from the Nitropolis series, introducing a grid-based cluster pays mechanics and ELK’s flagship CollectR, which features prominently in Pirots. This 94% RTR title puts the city’s troublesome rodents centre stage, with winning clusters, symbol upgrades and multipliers, while the CollectR mechanic adds an extra element of chaos. Rogue Rats is easily the franchise’s most interesting title, especially for cluster pays fans.
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Dirty Dawgs of Nitropolis – April 2024

Taking things back to basics, Dirty Dawgs of Nitropolis offers a more traditional gameplay experience, with six reels and 20 fixed paylines. This canine-led feature includes signature staples, such as Nitro Wild Reels and Nitro Feature Boxes, which add modifiers such as Wilds and respins, while the Free Spins round makes Nitro Wilds sticky for added winning potential, with a 25,000x maximum win. The simplicty is a breath of fresh air for fans of the Nitropolis series.
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Pug Thugs of Nitropolis – May 2024

Small dogs, big trouble! Pug Thugs of Nitropolis gives the city’s pint-sized troublemakers their moment in the spotlight with a barking mad take on traditional mechanics. the game features a 6×6 grid with winning connections from all four sides, creating a different experience from the familiar left-to-right setups with mechanics like Nitro Reels, Feature Screens, and the Free Spins Bonus. Rounding things off, it features high volatility and a 94% RTP.
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Nitropolis TV Slot

Nitropolis TV – February 2025

Though not part of the Battle of Nitropolis series, Nitropolis TV is one spin-off that deserves a mention. Story-wise, it follows the enthusiastic Wally as he sets up a makeshift studio on the roof of the city’s TV station. The familiar six-reel layout returns alongside Nitro Reels, Wilds, symbol upgrades, Big Symbols and win-both-ways modifiers with a 10,000x maximum win up for grabs, proving there’s still more characters and stories to explore after the main storyline’s conclusion!
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ELK Studios – The Studio Behind It All

ELK Studios Logo

ELK Studios

Known for its polished visuals and unconventional mechanics, ELK Studios is one of the industry’s most creative slot developers. Founded in Sweden in 2013, the studio is responsible for popular releases and series’ like Pirots, Wild Toro, and Tropicool, alongside the Nitropolis franchise. Their games are typically highy-volatile,with the studio’s signature X-iter feature offering alternative ways to access bonus rounds in eligible jurisdictions, taking an experimental approach to slot development, always.

RTPs in Nitropolis Slots

Like many games from ELK Studios, the Nitropolis slots historically tend to feature fixed RTPs, with most later releases sitting around the 94%-95% RTP mark. The only exception to this is the original game, with a 96.10% RTP.

The reason for these fixed RTPs is consistency, as we found out in our exclusive Q&A with ELK Studios in 2022.

The team explained they wanted players to enjoy a consistent experience regardless of which casino they played at, saving them to hassle of having to trawl through reviews and information sheets to find an operator offering the highest RTP configuration.

Of course, this isn’t ideal for players seeking the best returns, but it does offer some reassurance that players aren’t missing out on a more generous version of the same game elsewhere.

Quick Comparison

GameRTPVolatilityMaximum Win
Nitropolis96.10%High10,000x
Nitropolis 295%Medium-High10,000x
Nitropolis 395%High50,000x
Nitropolis 494%High50,000x
Gritty Kitty 94%High25,000x
Rogue Rats94%High25,000x
Dirty Dawgs94%High25,000x
Pug Thugs94%High25,000x
Nitropolis 594%High50,000x
Nitropolis TV94%High10,000x

Nitropolis Slots FAQs

  • What are Nitropolis slots?
    Nitropolis slots are a series of post-apocalyptic online slots developed by ELK Studios, featuring rival animal gangs battling for control of a mysterious green fuel known as Nitro. The games are known for their expanding reels, unusual modifiers, Nitro Reels, and highly volatile bonus features.
  • How many Nitropolis slots are there?
    There are currently 10 Nitropolis slots, including five numbered instalments, four clan-focused spin-offs and Nitropolis TV.
  • Who makes Nitropolis slots?
    All Nitropolis games are developed by ELK Studios, a Swedish provider founded in 2013. The studio is also known for popular franchises such as Pirots, Tropicool, and Cygnus.
  • Which Nitropolis slot has the highest RTP?
    The original Nitropolis has the highest commonly published RTP at 96.10%. Nitropolis 2 and 3 offer 95%, while the later numbered releases, clan spin-offs and Nitropolis TV generally feature 94% RTPs.
  • Which Nitropolis slot has the biggest maximum win?
    Nitropolis 3, Nitropolis 4 and Nitropolis 5 all share the highest advertised maximum win in the franchise at 50,000x your stake.
  • Are Nitropolis slots high volatility?
    Yes, most Nitropolis games are classified as high volatility, although Nitropolis 2 is sometimes listed as medium-high.
  • Can I play Nitropolis slots for free?
    Yes! Many Nitropolis slots are available in free demo mode, allowing you to explore their mechanics, characters and bonus features without risking real money.
  • Can you buy bonuses in Nitropolis slots?
    Many Nitropolis games feature ELK Studios’ X-iter mechanic, which offers different ways to access or increase the likelihood of triggering bonus features. However, bonus purchases aren’t permitted at UKGC-licensed online casinos, so UK players must trigger these features through regular gameplay.

Final Thoughts on Nitropolis Slots

Across the 10 releases, ELK Studios has blended elaborate storytelling, memorable characters, and widely inventive mechanics to create a fan-favourite franchise.

No two games are the same, as they push boundaries with varying modifiers, expanding Nitro Reels, and other explosive features. This willingness to experiment shows that ELK Studios is one of the industry’s true creative masterminds.

Still, with their lower-than-average RTP and dystopian world, these games won’t be everyone’s cup of tea. Use this page as a starting point to explore the entire franchise and compare RTPs, maximum wins, and volatility.

You can then explore our slot reviews for a closer look at individual releases, or play Nitropolis demo slots right here for free.

Always remember to gamble responsibly and never chase losses. For further resources and support, visit our Responsible Gambling page.

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Maya Sattar
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Maya Sattar

Head of Content

Maya is a beacon of knowledge in the online gambling space. Her main focus is on user experience and responsible gambling compliance, ensuring site content remains clear, accurate, and easy to understand. With years of experience behind her, she's well-placed to break down complex topics and deliver content that genuinely puts players first – always.

Jamie Rosen
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Jamie Rosen

Online Casino & iGaming Expert

Jamie Rosen is the co-founder of Fruity Slots and a leading voice in UK casino, slots, and lottery content. He began in real-money slot streaming on YouTube before building Fruity Slots into a large-scale review platform. Jamie focuses on player value, transparency, and explaining how casino games and slots products actually perform in real gameplay conditions.