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Nitropolis 4

Game information

Game developer ELK Studios
Progressive Jackpot
Configurable winlines
Free spins
Quickspin feature
Gamble feature
Bonus buy
Number of winlines 46656
Layout 4-4-4-4-4-4
Min bet $0.2
Max bet $50.0
Release date February 2023
Last update 19 May 2023
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Nitropolis 4

Try Nitropolis 4 slot online for free in demo mode with no download and no registration required and read the game's review before playing for real money.

5.8 Guru Score
Quick verdict
This high volatility dystopian-themed slot has a huge variety of bonus features and memorable animal characters, but a low RTP (94.00%) limits its appeal.
Read full review

About game provider

Nitropolis 4 review

Theme and Storyline

Nitropolis 4 transports players back to a dystopian vision of Earth, now run by dogs and a selection of other animals.

In this new incarnation of the franchise, the canines head out to drill for oil in the sea. Out on the rig, there are many perils, and players will need to stay ahead of the pack if they want to walk away with black gold.

Fans of the previous games in the Nitropolis series may be especially drawn to this slot.

Graphics, Sounds and Animations

The soundtrack has an edgy, futuristic feel with plenty of digital notes and metallic clanging. This adds tension and upholds the gritty, oil rig atmosphere. Occasionally, a male narrator makes quips over a radio and dogs bark in response.

As players enter the slot, there is an animated intro that introduces players to the new ocean oil rig setting. High quality graphics and an amusing skit ensure that players will be engaged.

The reels themselves are placed within the ornate machinery of the rig. In the distance, players will see the sun setting in the hazy sky.

Among the symbols, there are several characters that players will recognize from previous Nitropolis slots. The cast includes a goofy pug, a savvy cat, and a stern rottweiler. A rat in a hardhat also makes an appearance, his eyes narrowed as he evaluates the player from his reel.

Lower paying symbols consist of brightly colored letters that seem to be spray painted onto metal. This feels consistent with the cold, mechanical setting.

Together, the music and graphics create an attention-grabbing world of post-apocalyptic animals fun.


Nitropolis 4 is a six-reel, four-row slot. However, during each win an additional row is added, allowing the reels to grow up to eight rows tall.

Wins are awarded for landing matching symbols in adjacent reels, starting from the leftmost reel.

Whenever symbols form part of a winning combination, they will disappear. This allows new symbols to drop in from above.

Gameplay video

Wilds, Bonuses and Free Spins

The Wild symbol substitutes for all symbols except the Bonus symbol and the Super Bonus symbol.

During any spin, extra large symbols called Super symbols, 2x2 in size, or Mega symbols, 3x3 in size, may appear.

Nitro reels are special reels that cover two symbol positions and contain 4-12 paying symbols. Big Nitro reels cover six symbol positions and contain 2-6 symbols that are 2x2 in size.

Nitro Multipliers cover two symbol positions and multiply all wins in view.

The Nitro Booster has the ability to trigger a variety of special features, including:

When players land at least 3 Bonus symbols, the Free Spins Bonus begins. The number of free spins awarded depends on the number of Bonus symbols that trigger the feature as follows:

During the Free Spins feature, all Nitro reels are sticky, and the safety level progresses by one row for free spin that results in a win. The Free Spins feature can be retriggered.

The Super Bonus Game can be triggered by a combination of Bonus symbols and Super Bonus symbols. During this feature, the Max Rows and the Both Ways features are active.

Bet Sizes, RTP and Variance

The return to player of this game is 94.00%, well below our yardstick for average of roughly 96%.

The range of bets on the site we tested ran from a minimum bet per spin of $/£/€0.20 up to a maximum of $/£/€50 per spin.

The volatility of Nitropolis 4 is high, which could have made it a good match for our preferred slot machine strategies if the RTP was higher. Our slot strategies target the highest possible volatility.


We do not recommend this low RTP, high volatility dystopian-themed slot.

The frontend of Nitropolis 4 has undeniable flash and showmanship, but the RTP offered by this slot is too low for a recommendation.

The enormous variety of bonus features, and top notch animation may turn players’ heads, but they would be wise to move on to slots with higher RTPs.

Author: Jon Pill | This review was last updated: 19 May 2023
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