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Nitropolis 4

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Our rating:
  • A fun, well designed slot with detailed animations
  • The 4th in the series of the popular Nitropolis series of online slots
  • Highly volatile, with very high reward potential

Nitropolis 4 is the fourth instalment in the series from Elk Studios and we’re very excited to review this game. The previous slots in the series have been mostly excellent and some of our favourite volatile games to play, so let’s take a closer look at their newest version and see what’s different.
The theme here is as whacky as ever and many of the main characters remain such as a the tough Doberman dog, the out and the cat. Set in what appears to be some kind of lab, you have a set of 4 reels with 6 rows by default, offering 4,096 ways to win. Just spin the reels and work towards a winning combination of any of the following base symbols:

  • Jack, Queen, King or Ace
  • Rogue Rats or Pug Thugs Signs
  • Gravity Kitty or Dirty Dawgs Signs
  • Rat
  • Pug
  • Kitty
  • Dawg


Gov Icon
Gov Icon

Nitropolis 4 Bonuses And Features

Wild Symbols. These substitute for the base symbols above.

Avalanches. A common mechanic in slots like these, winning symbols are removed from the reels and new ones fall in from above, but each time this happens another row is added, giving you more ways to win, up to a maximum of 8 rows.

Nitro Booster. The booster adds up to 8 different features to the reels. These are:
Redrop. Nitro reels, multipliers, wild symbols and bonus symbols stay in place, while other symbols are removed for a respin.
Both Ways. Pays are made from both directions.
Max Rows. Expands the game up to 8 rows.
Garbage Collect. All instances of a random symbol are removed.
Nitro Appear. A nitro reel is added to the screen.
Nitro Wild. An existing nitro reel is filled with wilds.
Nitro Upgrade. An existing nitro reel is upgraded and more symbols are added to it.
Nitro Match. An existing nitro reel is matched with a symbol in view and filled with it.

Nitro Reels. These special reels cover 2 symbol positions and contain up to 12 symbols. Big version of it can exist, containing up to 6, 2×2 symbols.

Nitro Multiplier. A multiplier up to 12x can cover two symbol positions and multiplies all wins in view.

Free Spins Bonus. This is triggered by 3 or more bonus symbols, giving you 8, 12, 16 or 20 spins for 3, 4, 5 or 6 bonus symbols. During these, all nitro reels are sticky, and the bonus can be retriggered. A super bonus also exists, where a super bonus symbol is needed to trigger it. Now you play the bonus with all 8 rows and both ways are activated. In both bonuses, the number of rows does not reset between spins.


Nitropolis 4 slot from Elk Studios is another highly-impressive game, packed with features and a cool 50,000x win potential. Features include nitro reels, multipliers, lots of upgrade options and 2 main bonuses, each very impressive. The biggest let-down here is the RTP which stands at just 94%. This is significantly below the average of 96% and could put some players off, but aside form this it’s a great game and if you enjoy the others, I’m sure you’ll enjoy this one too.

A fun, high volatility slot





  • A great sequel in the series.
  • High value bonus potential.


  • Confusing game structure.

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