Nitropolis 4

Nitropolis 4, developed by ELK Studios, is a video slot that immerses players in a dystopian, post-apocalyptic world. Familiar animal gangs from prior Nitropolis titles resurface, this time battling for control of a colossal oil rig. The game establishes a dark, industrial atmosphere with a 6-reel grid set against a backdrop of towering oil derricks and churning machinery.

Core gameplay centers on Avalanche Wins. Winning symbols vanish from the reels, triggering new symbols to cascade from above. This can expand the grid by an additional row, potentially increasing the number of paylines from the base 4,096 to a substantial 737,280.

Several special symbols enhance gameplay and elevate win potential:

• Nitro Reels are colossal symbols spanning two reel positions and displaying 4, 6, 8, 10, or 12 matching symbols.
• Big Nitro Reel occupies six positions and displays between 2 and 6 giant symbols.
• Both Nitro Reels and Nitro Multipliers (which multiply wins by x4, x6, x10, or x12) persist during Avalanche Wins, increasing the likelihood of consecutive wins.

Nitro Boosters introduce another layer of unpredictable gameplay. These randomly triggered modifiers can significantly alter the game's flow. Eight potential Nitro Boosters exist, including Redrop (retains Bonus symbols and Nitro Reels for another drop), Both Ways (pays left to right and right to left), Garbage Collect (removes random symbols to trigger an Avalanche), and Max Rows (expands the grid to its maximum height).

The Free Spins bonus round is activated by landing 3 to 6 scatters (submarine symbols). Players receive 8, 12, 16, or 20 free spins accordingly. During free spins, Nitro Reels become sticky, remaining locked in place throughout the feature. Landing a Super Bonus symbol during the triggering spin activates the Super Bonus with Max Rows and Both Ways wins permanently in effect, offering even greater win potential.

In certain jurisdictions, players can leverage the X-iter™ Feature Buy option to bypass the base game and directly purchase various bonus features. These options include Bonus Hunt (increased chance of triggering the bonus round), Nitro Booster (guarantees two Nitro Boosters), Super Spin (guarantees a spin with Max Rows and Both Ways), Bonus (guarantees the base Free Spins), and Super Bonus (guarantees the Super Bonus Free Spins).

Nitropolis 4 builds upon the foundations laid by its predecessors, Nitropolis and Nitropolis 2, while introducing new features and mechanics. For players who enjoy the animal gang theme but prefer a different setting, spin-off titles like Dirty Dawgs of Nitropolis a better option. Those looking to see how the series has evolved might want to compare Nitropolis 4 with Nitropolis 3 or try the latest installment, Nitropolis 5, to experience the most recent innovations in the franchise.