Nitropolis 5 Slot (ELK Studios)

The Nitropolis 5 slot is played on 6 reels with 4 - 8 rows and there are 4,096 paylines. You must land between 3 - 6 matching symbols from left to right on consecutive reels to get a winning combination. Wins must start on the leftmost reel and pay from left to right with no gaps.

Bets for this game start at 20p and go up to £50. You can adjust your bet amount using the icon showing a pile of coins. Non-UK players can utilise the Autoplay function, which goes up to 100 spins. And the Quick Play function which speeds up spins.

The Nitropolis 5 RTP rate is 94%, which is below the online average of 96%, and the hit frequency is 18.1%. You’ll find a volatility rating of 'high', or 8 out of 10 and the maximum win is an impressive 50,000 x the bet.

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Queen of Bingo

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 involved creating great content and looking after marketing activities. Jenny is knowledgeable in all areas with specialisation in Bingo and Online Slots.

The final showdown has arrived, and the 4 animal clans are ready to face off against Sgt. Nitro Wolf once and for all in a battle for the stolen city of Nitropolis. In this dystopian, futuristic slot, the Rogue Rats, Gritty Kitty, Dirty Dawgs, and Pug Thugs band together to overthrow the corrupt Sergeant and reclaim their home.

As the game begins, you're greeted by a video of Nitropolis’ tyrannical leader, Sgt. Nitro Wolf, with his eerie yellow and green laser eyes. It shows the clan leaders meeting at 'rebel headquarters,' planning the attack and how they’ll overthrow the evil Seargent.

This game plays at the speed of light, and there’s so much going on. You're jettisoned into a nighttime scene that is stuffed to the stars with skyscrapers. It’s very industrial and kind of bleak. The figure of the resident bad guy Sgt. Nitro Wolf looms everywhere on digital posters all over the city. Like all dictators worth their salt, you can't get away from his face.

The game’s atmosphere is driven by a mix of techno beats, the hum of machinery, and drones flying overhead. When the bonus features kick in, the skies explode with bright colours, especially during the Boss Battle feature. In this superb sequence, you face off in space against Sgt. Nitro Wolf, who is equipped with a massive robotic battle suit.

On the reels, the highest-value symbol is the Rottweiler rebel, who is head of the Dirty Dawgs clan. 

Here’s a full list of symbols and values: 

• J: 3 = 0.1, 4 = 0.15, 5 = 0.2 or 6 = 0.25 x the bet
• Q: 3 = 0.1, 4 = 0.15, 5 = 0.2 or 6 = 0.25 x the bet
• K: 3 = 0.1, 4 = 0.15, 5 = 0.2 or 6= 0.25 x the bet
• A: 3 = 0.1, 4 = 0.15, 5 = 0.2 or 6 = 0.25x the bet
• Rogue Rats: 3 = 0.15, 4 = 0.2, 5= 0.25 or 6 = 0.3x the bet
• Pug Thugs: 3 = 0.15, 4 = 0.2, 5 = 0.25 or 6 = 0.3x the bet
• Gritty Kitty: 3  = 0.15, 4 = 0.2, 5 = 0.25 or 6 = 0.3x the bet
• Dirty Dawgs: 3 = 0.15, 4 = 0.2, 5 =  0.25 or 6 = 0.3x the bet
• Rat: 3 = 0.3, 4 = 0.5, 5 = 0.75 or 6 = 1x the bet
• Pug: 3 = 0.5, 4 = 0.75, 5 = 1 or 6 = 1.25x the bet
• Cat: 3 = 0.75, 4 = 1, 5 = 1.25 or 6 = 1.5x the bet
• Rottweiler: 3 = 1, 4 = 1.25, 5 = 1.5 or 6 = 3x the bet
• Wild: Substitutes for all other symbols apart from the bonus scatter
• Bonus Scatter: 3 or more trigger the free spins bonus game

The Nitropolis 5 Mobile

The Nitropolis 5 mobile slot is built with cutting-edge HTML5 technology, ensuring a premium Studios experience on both Android and iOS devices. It’s also fully compatible with tablets and desktops. For the best experience, ELK Studios suggests playing the game in a 1600×900 resolution, and, if scaling is necessary, maintaining a 16:9 aspect ratio.

Wow, there are so many features to cover in this game! It’s packed with them, there are 8 in total including big symbols, free spins, and avalanches, so let’s break it down right now:

Avalanches

Every time there is a win, the winning symbols explode and are removed from the grid to make way for new symbols, meaning more potential wins. This process repeats until there are no new wins.

Boss Battle

Landing 3 Boss Battle coins during the Nitro Booster triggers a face-off against Nitro Wolf. The main reels and the Nitro Booster are replaced by a different 7x8 grid. Each position has a blank coin or maximum win. You are given 3 shots; the feature finishes when no shots remain.

Nitro Multiplier

A Nitro multiplier covers 2 symbol positions and multiplies all wins in view. It has values ranging between 4x and 12x.

Big Symbols

Super symbols with a size of 2x2 and Mega symbols with a 3x3 size can appear randomly in any spin or symbol drop. If there’s an empty space below big symbols or big Nitro Reels, they’re filled with 1x1 symbols of the same type as the big symbol.

Nitro Reels

These reels cover two symbol positions and contain 4, 6, 8, 10 and 12 1x1 payout symbols. Big Nitro Reels cover six symbol positions and contain 2, 3, 4, 5 or 6 2x2 payout symbols.

NPD Holding Cells

Here, a symbol type can be chosen randomly during any spin. If the symbols of the chosen symbol type are part of a win, they are locked in and kept during a respin that also expands the main reels. The cycle continues as long as new symbols of the selected type contribute to the winning combo, the locked-in symbols then payout.

Bonus Game

Landing 3 or more bonus scatter symbols triggers the free spins bonus game. During the bonus, all nitro reels are sticky. You receive free spins based on how many bonus scatters you triggered. 

• 3 bonus scatters = 8 free spins 
• 4 bonus scatters = 12 free spins 
• 5 bonus scatters = 16 free spins 
• 6 bonus scatters = 20 free spins

During the free spins bonus game, the safety level advances one row for every new free spin initiated, which results in a win. It starts with a safety level of 4 rows, and every winning spin advances the safety level up to 8.

A combo of bonus symbols and a super bonus symbol triggers the Super Bonus Game, which is played with max rows and both ways activated and NPD Holding Cell triggers every free spin. Free spins can also be retriggered with the same level of bonus scatters above, giving the same amount of extra free spins. For example, 4 bonus scatters = 12 extra free spins.

Nitro Booster

You can see the Nitro Booster at the top of the grid which has 3 flippers, which award you modifiers. There are 11 different features on offer, from classic Nitro features such as Nitro Wild, to new Clan features such as Gritty Kitty that give a scatter win. There are 6 features linked to the main reels, and 5 are linked to the Nitro Reels. Here’s a full list of them:

• Dirty Dawgs: replaces some high-value symbols with the highest-value symbol
• Pug Thugs: moves a Nitro Reel to create or extend a win
• Gritty Kitty: selects a random symbol for a scatter win evaluation
• Rogue Rats: places a random number of Nitro Reels on the main grid
• Nitro Wild: fills all Nitro Reels below it with wilds
• Nitro Match: matches all Nitro Reels below it with a symbol on the same reel as the Nitro Reel or an adjacent reel to try to create a win.
• Nitro Upgrade: increases the size indicator on all Nitro Reels below it
• Max Rows: expands the grid to the maximum 8 rows high
• Respin: awards a respin at the end of the game round where Nitro Reels, Nitro Multipliers, bonus scatters, and wilds are kept sticky.
• Both Ways: evaluates wins from the leftmost and the rightmost reel.

Wow, his game is truly a feast for the eyes, and the ears for that matter. The immersive experience practically pulls you into the screen, with incredible detail in the base game: rich characters, towering skyscrapers, and intense rock music that sets the tone. The Boss Battle feature is particularly impressive when you fight against the Sergeant in some huge robotic suit. In between the rounds, there are cool-looking comic strip-style images that add to the atmosphere.

Each game in the series is packed with features, all of them featuring the iconic Nitro Reels. It’s especially exciting when the Nitro Reels cover 6 symbol positions and land multiple 2x2 payout symbols. 

The Nitro Booster was a highlight for me: watching the flippers activate a random modifier adds a fresh layer of excitement. There are plenty of options to enjoy, including high-value symbol replacements, grid extensions, and reels filled with wilds.

The Nitro Booster stood out for me, as it’s fun to see what modifier feature the flippers will award. There are plenty of options to enjoy, including high-value symbol replacements, grid extensions, and reels filled with wilds.

Nitropolis 5 ties for the top spot with 50,000 times bet max wins, alongside 5 other ELK Studios titles. The 1st Nitropolis game was released back in November 2020. And since then, ELK Studios has created games based on the 4 clans in the games: the Rogue Rats, Gritty Kitty, Dirty Dawgs and Pug Thugs.

ELK Studios was created in 2013, and it's known for its innovative games, many of which include animal themes. We have written this useful OLBG guide to the best ELK Studios slots. Some other top ELK Studios titles include Rabbit Royale, Pirots 3 and Nitropolis 4.

One negative of ELK Studios is its low RTP which tends to be 94%. However, that's the only drawback I could find for this game.

As you can tell by the expert verdict, I loved this game as there’s so much to enjoy. What a fantastic ending to this superb slot series, so it scores an impressive 4.8 out of 5.

The Nitropolis 5 slot review was written by our slot game experts on the OLBG Expert team. Beginning with Jenny Mason, our prime slot reviewer, who has 17+ years of experience working in iGaming for some of the UK’s top brands. Jenny is an expert in slots and bingo. It was then verified by Chris Taylor who has written over 10,000 slot game reviews in an iGaming career spanning over 2 decades.   

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.